Merge branch 'master' into Engine/move-gen

Engine/movebuffer

.github/workflows/dispatcher.yml

@@ -16,7 +16,9 @@ jobs:
       server: ${{ steps.check.outputs.server }}
       ui: ${{ steps.check.outputs.ui }}
     steps:
-      - uses: actions/checkout@v4
+      - name: checkout repository 
+        uses: actions/checkout@v4
+
       - name: Determine which tests to run
         id: check
         run: |
@@ -91,3 +93,6 @@ jobs:
           cd "$GITHUB_WORKSPACE"
           git clean -fdx
           git reset --hard
+
+
+

.github/workflows/release.yml

@@ -101,3 +101,5 @@ jobs:
             release/windows.zip
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+

.github/workflows/upload_data.yml

@@ -20,7 +20,7 @@ jobs:
           echo "$GOOGLE_SERVICE_ACCOUNT_JSON" > service_account.json
           
           python <<'PYCODE'
-          import gspread, json, subprocess
+          import gspread, json, subprocess, time
 
           creds = json.load(open("service_account.json"))
           gc = gspread.service_account_from_dict(creds)
@@ -38,6 +38,7 @@ jobs:
 
               for i, row in enumerate(rows_to_append):
                   worksheet.insert_row(row, start_row + i)
+                  time.sleep(1)
 
 
           with open(f"{v}/test_data.log", "r") as f:

Docs/Knightly rendszerterv v1.xml

@@ -0,0 +1,287 @@
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+          <mxGeometry x="400" y="1580" width="120" height="60" as="geometry" />
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+          <mxGeometry x="590" y="1290" width="170" height="110" as="geometry" />
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+        </mxCell>
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Docs/kovspec.md

@@ -22,6 +22,68 @@ A vágyálom rendszer alapját egy központi szerver képezné, amely kezeli a f
 A platform célja a megbízható és folyamatos működés, akár nagyobb terhelés mellett is. A rendszer fejlesztése során kiemelt szempont lenne a biztonság (adatvédelem, csalás elleni védelem), a stabil hálózati kommunikáció, valamint a bővíthetőség – például ranglisták, versenyek vagy mobilalkalmazás későbbi integrálásának lehetősége.
 
 Összességében a vágyálom rendszer egy minden szempontból teljes értékű, közösségorientált sakkalkalmazás lenne, amely a mostani, helyi hálózaton működő változatból fejlődne tovább egy interneten keresztül bárhonnan elérhető platformmá.
+
+## 3. Igényelt funkciók
+
+### Alapok
+- Két játékos közti sakkjátszma lebonyolítása.
+- Teljes szabályrendszer megvalósítása (érvényes lépések, sakk/sakkmatt/patt felismerése).
+- Új játék indítása.
+- Játékosok nevének megadása a játszma elején.
+- Felhasználóbarát grafikus felület (UI) – látható tábla, figurák, órák, státuszjelzések.
+- Játékoslépések vizuális kiemelése (pl. kijelölt mező, lehetséges lépések megjelenítése).
+- A játék állapotának kijelzése (folyamatban, sakk, matt, döntetlen).
+  
+### LAN és hálózati funkciók
+- „Szerver indítása” funkció – a játékos hostként indíthat egy helyi szervert.
+- „Csatlakozás” funkció – másik játékos IP-cím alapján tud csatlakozni.
+- Helyi hálózaton keresztüli valós idejű kommunikáció.
+- LAN játék automatikus felfedezése (broadcast keresés).
+- Játék mentése és visszatöltése hálózati módban.
+
+### Online vágyálom funkciók
+- Felhasználói regisztráció és bejelentkezés.
+- Jelszóval védett fiókok, email- vagy OAuth-alapú hitelesítés (Google, GitHub stb.).
+- Profiloldal megtekintése (név, avatar, statisztikák, értékszám).
+- Automatikus matchmaking rendszer.
+- Kézi játékindítás – meghívó küldése barátnak.
+- Játszmák mentése és visszajátszása.
+- Játszmaelemzés – lépések listázása, hibák kiemelése.
+- Webes felület vagy mobilalkalmazás támogatása.
+- Játék előzményeinek és statisztikáinak megtekintése (győzelmek, vereségek, döntetlenek).
+- Automatikus szervermentés és adatbázis szinkronizáció.
+
+### Felhasználói felület
+- Letisztult, reszponzív, platformfüggetlen felület (asztali és webes verzió).
+- Sötét/világos téma lehetősége.
+- Egyéni figurakészlet vagy tábla kinézet választása.
+- Animált figuramozgások.
+- Egérrel és billentyűzettel is vezérelhető játék.
+- Hangjelzések a lépésekhez és az idő lejártához.
+- Lépéselőzmények (move list) megjelenítése oldalt.
+- Tábla forgatásának lehetősége (pl. a fehér vagy fekete nézőpontból).
+- Állapotjelzők (sakk, matt, döntetlen, várakozás az ellenfélre).
+- Teljes képernyős mód.
+
+### Technikai / fejlesztői funkciók
+- Kliens–szerver architektúra.
+- REST API vagy WebSocket alapú kommunikáció.
+- Adatbázis a felhasználói adatok és meccsek tárolására (pl. SQLite, PostgreSQL, MongoDB).
+- Logolási és hibakezelési rendszer.
+- Automatikus mentés és adatvisszaállítás.
+- Verziókezelés (Git).
+- Tesztelhető, moduláris kódszerkezet (külön modulok: logika, UI, hálózat, adat).
+- Cross-platform működés (Windows, Linux, esetleg web).
+
+### További funkciók
+- Egyszemélyes mód (ember vs. gép, AI-bot).
+- Több nehézségi szintű AI.
+- Oktató mód (javasolt lépések, hibák magyarázata).
+- Hivatalos FEN/PGN formátum export/import.
+- Beépített sakkfeladványok, kihívások.
+- Érintéses vezérlés mobilon.
+- Többnyelvű felület (pl. magyar, angol).
+
 ## 4. Rendszer követelmények
 
 A rendszer célja egy kétjátékos sakkalkalmazás megvalósítása, amely alapvetően hálózati kapcsolat (LAN vagy internet) segítségével biztosítja a valós idejű játékot. A rendszer kliens–szerver architektúrán alapul, ahol az egyes komponensek jól elkülönülten, meghatározott feladatokat látnak el.

engine/Cargo.toml

@@ -4,4 +4,6 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-once_cell = "1.19"
+once_cell = "1.19"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"

engine/src/bitboard.rs

@@ -1 +1,10 @@
-mod attackmaps;
+mod attackmaps;
+mod utils;
+mod legality;
+mod checkinfo;
+mod attacks;
+mod bitmove;
+mod movebuffer;
+mod movegen;
+
+pub mod board;

engine/src/bitboard/attackmaps.rs

@@ -94,6 +94,64 @@ pub static RAY_TABLE: Lazy<[[u64; 8]; 64]> = Lazy::new(|| {
   return table;
 });
 
+// ROOK_MOVE_MASK[<square_index>]
+pub static ROOK_MOVE_MASK: Lazy<[u64; 64]> = Lazy::new(|| {
+  let mut table = [0u64; 64];
+
+  for sq in 0..64 {
+    for dir in [0, 2, 4, 6] {
+      table[sq] |= RAY_TABLE[sq][dir];
+    }
+  }
+  table
+});
+
+// BISHOP_MOVE_MASK[<square_index>]
+pub static BISHOP_MOVE_MASK: Lazy<[u64; 64]> = Lazy::new(|| {
+  let mut table = [0u64; 64];
+
+  for sq in 0..64 {
+    for dir in [1, 3, 5, 7] {
+      table[sq] |= RAY_TABLE[sq][dir];
+    }
+  }
+  table
+});
+
+// KING_SAFETY_ROOK_MASK[<square_index>]
+pub static KING_SAFETY_ROOK_MASK: Lazy<[u64; 64]> = Lazy::new(|| {
+  let mut table = [0u64; 64];
+
+  for sq in 0..64 {
+    let mut mask = KING_ATTACK_MAP[sq];
+
+    while mask != 0 {
+      let next_sq = mask.trailing_zeros();
+      table[sq] |= ROOK_MOVE_MASK[next_sq as usize];
+      mask &= !(1 << next_sq);
+    }
+  }
+
+  table
+});
+
+// KING_SAFETY_BISHOP_MASK[<square_index>]
+pub static KING_SAFETY_BISHOP_MASK: Lazy<[u64; 64]> = Lazy::new(|| {
+  let mut table = [0u64; 64];
+
+  for sq in 0..64 {
+    let mut mask = KING_ATTACK_MAP[sq];
+
+    while mask != 0 {
+      let next_sq = mask.trailing_zeros();
+      table[sq] |= BISHOP_MOVE_MASK[next_sq as usize];
+      mask &= !(1 << next_sq);
+    }
+  }
+
+  table
+});
+
 
 
 // <----- TESTS ----->

engine/src/bitboard/attacks.rs

@@ -0,0 +1,196 @@
+use super::board::Board;
+use super::attackmaps::*;
+
+impl Board {
+
+  const RANK_2: u64 = 0x0000_0000_0000_FF00;
+  const RANK_7: u64 = 0x00FF_0000_0000_0000;
+  const A_FILE: u64 = 0x0101_0101_0101_0101;
+  const H_FILE: u64 = 0x8080_8080_8080_8080;
+
+  pub fn get_pseudo_pawn_moves(&self, sq: u32) -> u64 {
+    let pawn: u64 = 1 << sq;
+    let mut move_mask: u64 = 0u64;
+    let move_offset: i8 = 8 - 16 * self.side_to_move as i8;
+
+    let next_sq: u64 = if move_offset > 0 {pawn << move_offset} else {pawn >> -move_offset};
+    if (self.occupancy[2] & next_sq) == 0 {
+      move_mask |= next_sq;
+
+      if (self.side_to_move == 0 && pawn & Self::RANK_2 != 0)
+        || (self.side_to_move == 1 && pawn & Self::RANK_7 != 0) {
+
+        let next_sq: u64 = if move_offset > 0 {next_sq << move_offset} else {next_sq >> -move_offset};
+        if (self.occupancy[2] & next_sq) == 0 {
+          move_mask |= next_sq;
+        }
+      }
+    }
+
+    return move_mask;
+  }
+  #[inline]
+  pub fn get_pseudo_knight_moves(&self, sq: u32) -> u64 {
+    return KNIGHT_ATTACK_MAP[sq as usize];
+  }
+  #[inline]
+  pub fn get_pseudo_king_moves(&self, sq: u32) -> u64 {
+    return KING_ATTACK_MAP[sq as usize];
+  }
+  #[inline]
+  pub fn get_pseudo_pawn_captures(&self, sq: u32) -> u64 {
+    return PAWN_ATTACK_MAP[sq as usize][self.side_to_move as usize];
+  }
+  #[inline]
+  pub fn get_pseudo_opponent_pawn_captures(&self, sq: u32) -> u64 {
+    return PAWN_ATTACK_MAP[sq as usize][1 - self.side_to_move as usize];
+  }
+  #[inline]
+  pub fn get_pseudo_bishop_moves(&self, sq: u32) -> u64 {
+    let mut  moves = 0u64;
+    let sq  = sq as usize;
+    let occupancy = self.occupancy[2];
+    moves |= get_raycast_from_square_in_direction(occupancy, sq, 1);
+    moves |= get_raycast_from_square_in_direction(occupancy, sq, 3);
+    moves |= get_raycast_from_square_in_direction(occupancy, sq, 5);
+    moves |= get_raycast_from_square_in_direction(occupancy, sq, 7);
+
+    return moves;
+  }
+  #[inline]
+  pub fn get_pseudo_rook_moves(&self, sq: u32) -> u64 {
+    let mut moves: u64 = 0u64;
+    let occupancy = self.occupancy[2];
+    let sq = sq as usize;
+    moves |= get_raycast_from_square_in_direction(occupancy, sq, 0);
+    moves |= get_raycast_from_square_in_direction(occupancy, sq, 2);
+    moves |= get_raycast_from_square_in_direction(occupancy, sq, 4);
+    moves |= get_raycast_from_square_in_direction(occupancy, sq, 6);
+
+    return moves;
+  }
+  #[inline(always)]
+  pub fn get_pseudo_queen_moves(&self, sq: u32) -> u64 {
+    return self.get_pseudo_bishop_moves(sq) | self.get_pseudo_rook_moves(sq);
+  }
+
+  #[inline]
+  pub fn get_pseudo_bishop_moves_ignore_king(&self, sq: u32) -> u64 {
+    let mut  moves = 0u64;
+    let sq  = sq as usize;
+    let king = self.bitboards[5 + 6*self.side_to_move as usize];
+    let occupancy = self.occupancy[2] & !king;
+    moves |= get_raycast_from_square_in_direction(occupancy, sq, 1);
+    moves |= get_raycast_from_square_in_direction(occupancy, sq, 3);
+    moves |= get_raycast_from_square_in_direction(occupancy, sq, 5);
+    moves |= get_raycast_from_square_in_direction(occupancy, sq, 7);
+
+    return moves;
+  }
+  #[inline]
+  pub fn get_pseudo_rook_moves_ignore_king(&self, sq: u32) -> u64 {
+    let mut moves: u64 = 0u64;
+    let sq = sq as usize;
+    let king = self.bitboards[5 + 6*self.side_to_move as usize];
+    let occupancy = self.occupancy[2] & !king;
+    moves |= get_raycast_from_square_in_direction(occupancy, sq, 0);
+    moves |= get_raycast_from_square_in_direction(occupancy, sq, 2);
+    moves |= get_raycast_from_square_in_direction(occupancy, sq, 4);
+    moves |= get_raycast_from_square_in_direction(occupancy, sq, 6);
+
+    return moves;
+  }
+
+  #[inline]
+  pub fn is_square_attacked(&self, king_sq: u32) -> bool {
+    let offset: usize = 6 * self.side_to_move as usize;
+
+    // rook-queen checks (+)
+    let mut threat_mask: u64 = self.get_pseudo_rook_moves(king_sq);
+    let mut attacker_mask: u64 = self.bitboards[10 - offset] | self.bitboards[9 - offset];
+    if threat_mask & attacker_mask != 0 { return true; }
+
+    // bishop-queen checks (x)
+    threat_mask = self.get_pseudo_bishop_moves(king_sq);
+    attacker_mask = self.bitboards[10 - offset] | self.bitboards[8 - offset];
+    if threat_mask & attacker_mask != 0 { return true; }
+
+    // knight checks (L)
+    threat_mask = KNIGHT_ATTACK_MAP[king_sq as usize];
+    attacker_mask = self.bitboards[7 - offset];
+    if threat_mask & attacker_mask != 0 { return true; }
+
+    // pawn checks (v)
+    threat_mask = PAWN_ATTACK_MAP[king_sq as usize][self.side_to_move as usize];
+    attacker_mask = self.bitboards[6 - offset];
+    return threat_mask & attacker_mask != 0;
+  }
+  pub fn get_safe_king_squares(&self) -> u64 {
+    let offset: usize = 6 * (1 - self.side_to_move as usize);
+    let king_sq = self.bitboards[11 - offset].trailing_zeros() as usize;
+    let bishop_mask = KING_SAFETY_BISHOP_MASK[king_sq];
+    let rook_mask = KING_SAFETY_ROOK_MASK[king_sq];
+    let mut attack_map: u64 = 0u64;
+
+    let mut board: u64 = self.bitboards[offset];
+    if self.side_to_move() == 0 {
+      attack_map |= (board >> 9 & !Self::H_FILE) | (board >> 7 & !Self::A_FILE);
+    }
+    else {
+      attack_map |= (board << 9 & !Self::A_FILE) | (board << 7 & !Self::H_FILE);
+    }
+
+    board = self.bitboards[offset + 1];
+    while board != 0 {
+      let piece_sq: u32 = board.trailing_zeros();
+      board &= !(1 << piece_sq);
+
+      attack_map |= self.get_pseudo_knight_moves(piece_sq);
+    }
+
+    board = self.bitboards[offset + 2] & bishop_mask;
+    while board != 0 {
+      let piece_sq: u32 = board.trailing_zeros();
+      board &= !(1 << piece_sq);
+
+      attack_map |= self.get_pseudo_bishop_moves_ignore_king(piece_sq);
+    }
+
+    board = self.bitboards[offset + 3] & rook_mask;
+    while board != 0 {
+      let piece_sq: u32 = board.trailing_zeros();
+      board &= !(1 << piece_sq);
+
+      attack_map |= self.get_pseudo_rook_moves_ignore_king(piece_sq);
+    }
+
+    board = self.bitboards[offset + 4] & (bishop_mask | rook_mask);
+    while board != 0 {
+      let piece_sq: u32 = board.trailing_zeros();
+      board &= !(1 << piece_sq);
+
+      attack_map |= self.get_pseudo_rook_moves_ignore_king(piece_sq) | self.get_pseudo_bishop_moves_ignore_king(piece_sq);
+    }
+
+    board = self.bitboards[offset + 5];
+    let piece_sq: u32 = board.trailing_zeros();
+    attack_map |= self.get_pseudo_king_moves(piece_sq);
+
+    return !attack_map;
+  }
+}
+
+#[inline(always)]
+pub fn get_raycast_from_square_in_direction(occupancy: u64, sq: usize, dir: usize) -> u64 {
+  let is_up: bool = dir / 4 == 0;
+  let mut ray: u64 = RAY_TABLE[sq][dir];
+  let blockers: u64 = occupancy & ray;
+
+  if blockers != 0 {
+    let first_blocker: u32 = if is_up { blockers.trailing_zeros() } else { 63 - blockers.leading_zeros() };
+
+    ray &= !RAY_TABLE[first_blocker as usize][dir];
+  }
+
+  return ray;
+}

engine/src/bitboard/bitmove.rs

@@ -0,0 +1,77 @@
+use super::utils::*;
+
+#[derive(Copy, Clone, PartialEq, Eq)]
+pub struct BitMove {
+
+  move_type: BitMoveType,
+  from_square: u8,
+  to_square: u8,
+  promotion_piece: Option<u8>
+}
+
+impl BitMove {
+
+  #[inline]
+  pub fn quiet(from: u8, to: u8, promotion_piece: Option<u8>) -> Self {
+    return Self {
+      move_type: BitMoveType::Quiet,
+      from_square: from,
+      to_square: to,
+      promotion_piece: promotion_piece
+    };
+  }
+  #[inline]
+  pub fn capture(from: u8, to: u8, promotion_piece: Option<u8>) -> Self {
+    return Self {
+      move_type: BitMoveType::Capture,
+      from_square: from,
+      to_square: to,
+      promotion_piece: promotion_piece
+    };
+  }
+  #[inline]
+  pub fn castle(from: u8, to: u8) -> Self {
+    return Self {
+      move_type: BitMoveType::Castle,
+      from_square: from,
+      to_square: to,
+      promotion_piece: None
+    };
+  }
+
+  #[inline(always)]
+  pub fn move_type(&self) -> BitMoveType {
+    return self.move_type;
+  }
+  #[inline(always)]
+  pub fn from_square(&self) -> u8 {
+    return self.from_square;
+  }
+  #[inline(always)]
+  pub fn to_square(&self) -> u8 {
+    return self.to_square;
+  }
+  #[inline(always)]
+  pub fn promotion_piece(&self) -> Option<u8> {
+    return self.promotion_piece;
+  }
+
+  pub fn uci_notation(&self) -> String {
+    let mut notation = notation_from_square_number(self.from_square());
+    notation.push_str(&notation_from_square_number(self.to_square()));
+
+    if let Some(promotion_piece) = self.promotion_piece {
+      notation.push(get_character_by_piece_id(promotion_piece).to_ascii_lowercase());
+    }
+
+    return notation;
+  }
+}
+
+#[derive(Copy, Clone, PartialEq, Eq)]
+pub enum BitMoveType {
+  Quiet,
+  Capture,
+  Castle,
+  EnPassant
+}

engine/src/bitboard/board.rs

@@ -0,0 +1,199 @@
+use super::utils::try_get_square_number_from_notation;
+
+pub struct Board {
+  pub(in super) bitboards: [u64; 12],     // 0-5 -> white pieces (P, N, B, R, Q, K), 6-11 -> black pieces (p, n, b, r, q, k)
+  pub(in super) piece_board: [u8; 64],    // same as board indexes, 12 -> empty square
+  pub(in super) occupancy: [u64; 3],      // 0 -> white, 1 -> black, 2 -> combined
+  pub(in super) castling_rights: u8,      // 0b0000_KQkq
+  pub(in super) pinned_squares: [u8; 64], // 0 -> E-W, 1 -> NE-SW, 2 -> N-S, 3 -> SE-NW, 4 -> no pin
+  pub(in super) pin_mask: u64,            // 1 -> pin, 0 -> no pin
+  pub(in super) en_passant_square: u64,   // 1 -> ep square, 0 -> no ep square
+  pub(in super) side_to_move: u8          // 0 -> white to play, 1 -> black to play
+}
+
+impl Board {
+
+  pub fn new_clear() -> Self {
+    let mut bit_board: Self = Self {
+      bitboards: [0x0000_0000_0000_0000; 12],
+      piece_board: [12; 64],
+      occupancy: [0x0000_0000_0000_0000; 3],
+      castling_rights: 0b0000_0000,
+      pinned_squares: [4; 64],
+      pin_mask: 0u64,
+      en_passant_square: 0x0000_0000_0000_0000,
+      side_to_move: 0
+    };
+
+    return bit_board;
+  }
+  pub fn new() -> Self {
+    let mut bit_board: Board = Self {
+      bitboards: [0x0000_0000_0000_FF00,
+                0x0000_0000_0000_0042,
+                0x0000_0000_0000_0024,
+                0x0000_0000_0000_0081,
+                0x0000_0000_0000_0008,
+                0x0000_0000_0000_0010,
+                0x00FF_0000_0000_0000,
+                0x4200_0000_0000_0000,
+                0x2400_0000_0000_0000,
+                0x8100_0000_0000_0000,
+                0x0800_0000_0000_0000,
+                0x1000_0000_0000_0000],
+      piece_board: [12; 64],
+      occupancy: [0; 3],
+      castling_rights: 0b0000_1111,
+      pinned_squares: [4; 64],
+      pin_mask: 0u64,
+      en_passant_square: 0x0000_0000_0000_0000,
+      side_to_move: 0
+    };
+    bit_board.calc_occupancy();
+    bit_board.calc_piece_board();
+
+    return bit_board;
+  }
+  pub fn build(fen: &str) -> Self {
+    let mut board: Board = Board::new_clear();
+
+    let mut col: i32 = 0;
+    let mut row: i32 = 7;
+    let pieces: [char; 12] = ['p', 'n', 'b', 'r', 'q', 'k', 'P', 'N', 'B', 'R', 'Q', 'K'];
+    let mut coming_up: &str = fen;
+
+    for (i, c) in coming_up.chars().enumerate() {
+      if pieces.contains(&c) {
+        board.place_piece(row*8 + col, c);
+        col += 1;
+      }
+      else if ('1'..='8').contains(&c) {
+        col += c.to_string().parse::<i32>().unwrap();
+      }
+      else if c == '/' {
+        row -= 1;
+        col = 0;
+      }
+      else {
+        coming_up = &coming_up[i+1..];
+        break;
+      }
+    }
+    board.calc_occupancy();
+    
+    match coming_up.chars().next().unwrap() {
+      'w' => board.side_to_move = 0,
+      'b' => board.side_to_move = 1,
+       _  => panic!("invalid fen notation / to be handled later")
+    }
+    coming_up = &coming_up[2..];
+
+    for (i, c) in coming_up.chars().enumerate() {
+      match c {
+        'K' => board.castling_rights |= 1 << 3,
+        'Q' => board.castling_rights |= 1 << 2,
+        'k' => board.castling_rights |= 1 << 1,
+        'q' => board.castling_rights |= 1,
+        '-' => {
+          coming_up = &coming_up[i+2..];
+          break;
+        }
+         _  => {
+          coming_up = &coming_up[i+1..];
+          break;
+        }
+      }
+    }
+    match coming_up.chars().next().unwrap() {
+      '-' => {
+          coming_up = &coming_up[1..];
+        }
+       _  => {
+          let notation = coming_up.split(' ').next().unwrap();
+          if let Ok(epsq_index) = try_get_square_number_from_notation(notation) {
+            board.en_passant_square = 1 << epsq_index;
+          }
+       }
+    }
+    board.calc_pinned_squares();
+    board.calc_piece_board();
+
+    return board;
+  }
+
+  #[inline(always)]
+  pub fn bitboards(&self, index: usize) -> u64 {
+    return self.bitboards[index];
+  }
+  #[inline(always)]
+  pub fn piece_board(&self, sq: u8) -> u8 {
+    return self.piece_board[sq as usize];
+  }
+  #[inline(always)]
+  pub fn occupancy(&self, side: usize) -> u64 {
+    return self.occupancy[side];
+  }
+  #[inline(always)]
+  pub fn castling_rights(&self) -> u8 {
+    return self.castling_rights;
+  }
+  #[inline(always)]
+  pub fn pinned_squares(&self, sq: usize) -> u8 {
+    return self.pinned_squares[sq];
+  }
+  #[inline(always)]
+  pub fn pin_mask(&self) -> u64 {
+    return self.pin_mask;
+  }
+  #[inline(always)]
+  pub fn en_passant_square(&self) -> u64 {
+    return self.en_passant_square;
+  }
+  #[inline(always)]
+  pub fn side_to_move(&self) -> u8 {
+    return self.side_to_move;
+  }
+
+  #[inline(always)]
+  pub fn current_king_square(&self) -> u32 {
+    return if self.side_to_move == 0 { self.bitboards[5].trailing_zeros() } else { self.bitboards[11].trailing_zeros() };
+  }
+
+  fn calc_occupancy(&mut self) {
+    self.occupancy = [0u64; 3];
+    for b in 0..6 {
+      self.occupancy[0] |= self.bitboards[b];
+    }
+    for b in 6..12 {
+      self.occupancy[1] |= self.bitboards[b];
+    }
+    self.occupancy[2] = self.occupancy[0] | self.occupancy[1];
+  }
+  fn calc_piece_board(&mut self) {
+    for sq in 0..64 {
+      for b in 0..12 {
+        if (self.bitboards[b as usize] & 1 << sq) != 0 {
+          self.piece_board[sq] = b;
+        }
+      }
+    }
+  }
+
+  pub fn place_piece(&mut self, sq: i32, piece: char) {
+    match piece {
+      'p' => {self.bitboards[6] |= 1 << sq}
+      'n' => {self.bitboards[7] |= 1 << sq}
+      'b' => {self.bitboards[8] |= 1 << sq}
+      'r' => {self.bitboards[9] |= 1 << sq}
+      'q' => {self.bitboards[10] |= 1 << sq}
+      'k' => {self.bitboards[11] |= 1 << sq}
+      'P' => {self.bitboards[0] |= 1 << sq}
+      'N' => {self.bitboards[1] |= 1 << sq}
+      'B' => {self.bitboards[2] |= 1 << sq}
+      'R' => {self.bitboards[3] |= 1 << sq}
+      'Q' => {self.bitboards[4] |= 1 << sq}
+      'K' => {self.bitboards[5] |= 1 << sq}
+       _  => ()
+    }
+  }
+}

engine/src/bitboard/checkinfo.rs

@@ -0,0 +1,21 @@
+
+pub struct CheckInfo {
+  pub check_count: u8,
+  pub move_mask: u64
+}
+
+impl CheckInfo {
+
+  pub fn new() -> Self {
+    return Self {
+      check_count: 0,
+      move_mask: 0xFFFF_FFFF_FFFF_FFFF
+    }
+  }
+
+  #[inline(always)]
+  pub fn add_checker(&mut self, move_mask: u64) {
+    self.move_mask &= move_mask;
+    self.check_count += 1;
+  }
+}

engine/src/bitboard/legality.rs

@@ -0,0 +1,134 @@
+use super::board::Board;
+use super::attackmaps::RAY_TABLE;
+use super::checkinfo::CheckInfo;
+use super::attacks::get_raycast_from_square_in_direction;
+
+impl Board {
+
+  pub fn check_test(&self) -> CheckInfo {
+    let mut check_info: CheckInfo = CheckInfo::new();
+    let offset: usize = 6 * self.side_to_move as usize;
+    let king: u64 = self.bitboards[5 + offset];
+    let king_sq = king.trailing_zeros() as usize;
+    let occupancy = self.occupancy[2];
+
+    // queen-rook checks (+)
+    let attacker_mask = self.bitboards[10 - offset] | self.bitboards[9 - offset];
+
+    for dir in [0, 2, 4, 6] {
+      let threat_mask: u64 = get_raycast_from_square_in_direction(occupancy, king_sq, dir);
+      if threat_mask & attacker_mask != 0 {
+        check_info.add_checker(threat_mask);
+      }
+    }
+
+    // queen-bishop checks (x)
+    let attacker_mask = self.bitboards[10 - offset] | self.bitboards[8 - offset];
+
+    for dir in [1, 3, 5, 7] {
+      let threat_mask = get_raycast_from_square_in_direction(occupancy, king_sq, dir);
+      if threat_mask & attacker_mask != 0 {
+        check_info.add_checker(threat_mask);
+      }
+    }
+
+    // knight checks (L)
+    let attacker_mask = self.bitboards[7 - offset];
+    let threat_mask = self.get_pseudo_knight_moves(king_sq as u32);
+    let checker = threat_mask & attacker_mask;
+    if checker != 0 {
+      check_info.add_checker(checker);
+    }
+
+    // pawn checks (v)
+    let attacker_mask = self.bitboards[6 - offset];
+    let threat_mask = self.get_pseudo_pawn_captures(king_sq as u32);
+    let checker = threat_mask & attacker_mask;
+    if checker != 0 {
+      check_info.add_checker(checker);
+    }
+
+    return check_info;
+  }
+
+  pub(in super) fn calc_pinned_squares(&mut self) {
+    self.pinned_squares = [4; 64];
+    self.pin_mask = 0u64;
+
+    let friendly_pieces: u64 = self.occupancy[self.side_to_move as usize];
+    let offset: usize = 6 * self.side_to_move as usize;
+    let king_board: u64 = self.bitboards[5 + offset];
+    let king_sq: u32 = king_board.trailing_zeros();
+    let opponent_queen_bishop_mask: u64 = self.bitboards[8 - offset] | self.bitboards[10 - offset];
+    let opponent_queen_rook_mask: u64 = self.bitboards[9 - offset] | self.bitboards[10 - offset];
+
+    // Queen-Rook directions
+    self.set_pinned_in_ray_direction(king_sq, friendly_pieces, opponent_queen_rook_mask, 0);
+    self.set_pinned_in_ray_direction(king_sq, friendly_pieces, opponent_queen_rook_mask, 2);
+    self.set_pinned_in_ray_direction(king_sq, friendly_pieces, opponent_queen_rook_mask, 4);
+    self.set_pinned_in_ray_direction(king_sq, friendly_pieces, opponent_queen_rook_mask, 6);
+
+    // Queen-Bishop directions
+    self.set_pinned_in_ray_direction(king_sq, friendly_pieces, opponent_queen_bishop_mask, 1);
+    self.set_pinned_in_ray_direction(king_sq, friendly_pieces, opponent_queen_bishop_mask, 3);
+    self.set_pinned_in_ray_direction(king_sq, friendly_pieces, opponent_queen_bishop_mask, 5);
+    self.set_pinned_in_ray_direction(king_sq, friendly_pieces, opponent_queen_bishop_mask, 7);
+  }
+
+  pub(in super) fn set_pinned_in_ray_direction(&mut self, king_sq: u32, friendly_pieces: u64, attackers: u64, dir: u8) {
+    let is_up: bool = dir / 4 == 0;
+    let mask: u64 = RAY_TABLE[king_sq as usize][dir as usize];
+    let blockers: u64 = self.occupancy[2] & mask;
+    if blockers == 0 { return; }
+    let first_blocker_sq: u32 = if is_up { blockers.trailing_zeros() } else { 63 - blockers.leading_zeros() };
+    if (friendly_pieces & 1 << first_blocker_sq) != 0 {
+      let blockers: u64 = blockers & !(1 << first_blocker_sq);
+      if blockers == 0 { return; }
+      let second_blocker_sq: u32 = if is_up { blockers.trailing_zeros() } else { 63 - blockers.leading_zeros() };
+
+      if (attackers & 1 << second_blocker_sq) != 0 {
+        self.pinned_squares[first_blocker_sq as usize] = dir % 4;
+        self.pin_mask |= 1 << first_blocker_sq;
+      }
+    }
+  }
+
+  #[inline]
+  pub(in super) fn get_pin_masked_moves(&self, moves: u64, sq: u32) -> u64 {
+    let sq: usize = sq as usize;
+    if self.pinned_squares[sq] == 4 { return moves; }
+    let dir: u8 = self.pinned_squares[sq];
+    return moves & (RAY_TABLE[sq][dir as usize] | RAY_TABLE[sq][4 + dir as usize]);
+  }
+}
+
+// <----- TESTS ----->
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+
+  #[test]
+  fn check_test_test() {
+
+    let fens = [
+      "rnb1k1nr/pppppppp/4q3/8/1b6/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",      // no check
+      "rnb1k1nr/pppppppp/4q3/8/1b1P4/8/PPP1PPPP/RNBQKBNR w KQkq d3 0 1",   // single check
+      "rnb1k1nr/ppp1p2p/3pq1p1/8/1b1P1P2/8/PPP2PPP/RNBQKBNR w KQkq - 0 1"  // double check
+      ];
+    let expected_results = [
+      CheckInfo { check_count: 0, move_mask: 0xFFFF_FFFF_FFFF_FFFF },
+      CheckInfo { check_count: 1, move_mask: 0x0000_0000_0204_0800 },
+      CheckInfo { check_count: 2, move_mask: 0x0000_0000_0000_0000 }
+    ];
+
+    for test_nr in 0..3 {
+      let fen = fens[test_nr];
+      let board =  Board::build(fen);
+      let check_test_actual = board.check_test();
+      assert_eq!(check_test_actual.check_count, expected_results[test_nr].check_count);
+      assert_eq!(check_test_actual.move_mask, expected_results[test_nr].move_mask);
+    }
+
+  }
+}

engine/src/bitboard/movebuffer.rs

@@ -0,0 +1,44 @@
+use super::bitmove::BitMove;
+
+pub struct MoveBuffer {
+
+  buffer: [BitMove; 256],
+  count: usize
+}
+
+impl MoveBuffer {
+
+  pub fn new() -> Self {
+    return Self {
+      buffer: [BitMove::quiet(0, 0, None); 256],
+      count: 0
+    };
+  }
+
+  #[inline]
+  pub fn add(&mut self, bitmove: BitMove) {
+    self.buffer[self.count] = bitmove;
+    self.count += 1;
+  }
+  #[inline]
+  pub fn append(&mut self, other: &MoveBuffer) {
+    self.buffer[self.count..self.count + other.count()].copy_from_slice(other.contents());
+    self.count += other.count();
+  }
+  #[inline(always)]
+  pub fn clear(&mut self) {
+    self.count = 0;
+  }
+  #[inline(always)]
+  pub fn count(&self) -> usize{
+    return self.count;
+  }
+  #[inline(always)]
+  pub fn get(&self, idx: usize) -> &BitMove {
+    return &self.buffer[idx];
+  }
+  #[inline(always)]
+  pub fn contents(&self) -> &[BitMove] {
+    return &self.buffer[0..self.count];
+  } 
+}

engine/src/bitboard/movegen.rs

@@ -0,0 +1,67 @@
+mod pawns;
+mod knights;
+mod bishops;
+mod rooks;
+mod queens;
+mod kings;
+
+use super::board::Board;
+use super::movebuffer::MoveBuffer;
+use super::bitmove::BitMove;
+use super::checkinfo::CheckInfo;
+use super::utils::*;
+
+impl Board {
+
+  const NO_FILTER: u64 = 0xFFFF_FFFF_FFFF_FFFF;
+
+  pub fn collect_moves(&mut self, buffer: &mut MoveBuffer, temp_buffer: &mut MoveBuffer) -> bool {
+    buffer.clear();
+    self.calc_pinned_squares();
+    let check_info = self.check_test();
+
+    match check_info.check_count {
+      0 => self.collect_all_moves(buffer, temp_buffer),
+      1 => self.collect_moves_single_check(buffer, temp_buffer, &check_info),
+      2 => self.collect_king_evasion(buffer, temp_buffer),
+      _ => panic!("More than 2 checking pieces found as the same time!")
+    }
+    return check_info.check_count > 0;
+  }
+
+  pub(in super) fn collect_all_moves(&self, buffer: &mut MoveBuffer, temp_buffer: &mut MoveBuffer) {
+    let safe_squares = self.get_safe_king_squares();
+
+    self.add_pawn_moves(buffer, temp_buffer, Self::NO_FILTER);
+    self.add_knight_moves(buffer, temp_buffer, Self::NO_FILTER);
+    self.add_bishop_moves(buffer, temp_buffer, Self::NO_FILTER);
+    self.add_rook_moves(buffer, temp_buffer, Self::NO_FILTER);
+    self.add_queen_moves(buffer, temp_buffer, Self::NO_FILTER);
+    self.add_king_moves(buffer, temp_buffer, safe_squares);
+    self.add_king_castles(buffer, safe_squares);
+
+    buffer.append(temp_buffer);
+    temp_buffer.clear();
+  }
+  pub(in super) fn collect_moves_single_check(&self, buffer: &mut MoveBuffer, temp_buffer: &mut MoveBuffer, check_info: &CheckInfo) {
+    let safe_squares = self.get_safe_king_squares();
+
+    self.add_pawn_moves(buffer, temp_buffer, check_info.move_mask);
+    self.add_knight_moves(buffer, temp_buffer, check_info.move_mask);
+    self.add_bishop_moves(buffer, temp_buffer, check_info.move_mask);
+    self.add_rook_moves(buffer, temp_buffer, check_info.move_mask);
+    self.add_queen_moves(buffer, temp_buffer, check_info.move_mask);
+    self.add_king_moves(buffer, temp_buffer, safe_squares);
+
+    buffer.append(temp_buffer);
+    temp_buffer.clear();
+  }
+  pub(in super) fn collect_king_evasion(&self, buffer: &mut MoveBuffer, temp_buffer: &mut MoveBuffer) {
+    let safe_squares = self.get_safe_king_squares();
+
+    self.add_king_moves(buffer, temp_buffer, safe_squares);
+
+    buffer.append(&temp_buffer);
+    temp_buffer.clear();
+  }
+}

engine/src/bitboard/movegen/bishops.rs

@@ -0,0 +1,55 @@
+use super::*;
+
+impl Board {
+
+  pub fn add_bishop_moves(&self, capture_buffer: &mut MoveBuffer, quiet_buffer: &mut MoveBuffer, move_mask: u64) {
+    let piece_index = 2 + self.side_to_move * 6;
+    let mut bishops = self.bitboards[piece_index as usize];
+    let empty = !self.occupancy[2];
+    let opponents = self.occupancy[1 - self.side_to_move as usize];
+    while bishops != 0 {
+      let from_sq = pop_lsb(&mut bishops);
+      let raw_move_map = self.get_pseudo_bishop_moves(from_sq) & move_mask;
+      let move_map = self.get_pin_masked_moves(raw_move_map, from_sq);
+
+      let mut quiet_map = move_map & empty;
+      let mut capture_map = move_map & opponents;
+
+      while quiet_map != 0 {
+        let to_sq = pop_lsb(&mut quiet_map);
+        quiet_buffer.add(BitMove::quiet(
+          from_sq as u8,
+          to_sq as u8,
+          None
+        ));
+      }
+      while capture_map != 0 {
+        let to_sq = pop_lsb(&mut capture_map);
+        capture_buffer.add(BitMove::capture(
+          from_sq as u8,
+          to_sq as u8,
+          None
+        ));
+      }
+    }
+  }
+  pub fn add_bishop_captures(&self, buffer: &mut MoveBuffer, move_mask: u64) {
+    let offset = 6 * self.side_to_move as usize;
+    let mut bishops: u64 = self.bitboards[2 + offset];
+    let opponents = self.occupancy[1 - self.side_to_move as usize];
+    while bishops != 0 {
+      let next_sq: u32 = pop_lsb(&mut bishops);
+      let mut attacks: u64 = self.get_pseudo_bishop_moves(next_sq) & opponents & move_mask;
+      attacks = self.get_pin_masked_moves(attacks, next_sq);
+
+      while attacks != 0 {
+        let to_sq = pop_lsb(&mut attacks);
+        buffer.add(BitMove::capture(
+          next_sq as u8,
+          to_sq as u8,
+          None
+        ));
+      }
+    }
+  }
+}

engine/src/bitboard/movegen/kings.rs

@@ -0,0 +1,88 @@
+use super::*;
+
+impl Board {
+
+  pub fn add_king_moves(&self, capture_buffer: &mut MoveBuffer, quiet_buffer: &mut MoveBuffer, move_mask: u64) {
+    let piece_index = 5 + self.side_to_move * 6;
+    let mut kings = self.bitboards[piece_index as usize];
+    let empty = !self.occupancy[2];
+    let opponents = self.occupancy[1 - self.side_to_move as usize];
+    while kings != 0 {
+      let from_sq = pop_lsb(&mut kings);
+      let move_map = self.get_pseudo_king_moves(from_sq) & move_mask;
+
+      let mut quiet_map = move_map & empty;
+      let mut capture_map = move_map & opponents;
+
+      while quiet_map != 0 {
+        let to_sq = pop_lsb(&mut quiet_map);
+        quiet_buffer.add(BitMove::quiet(
+          from_sq as u8,
+          to_sq as u8,
+          None
+        ));
+      }
+      while capture_map != 0 {
+        let to_sq = pop_lsb(&mut capture_map);
+        capture_buffer.add(BitMove::capture(
+          from_sq as u8,
+          to_sq as u8,
+          None
+        ));
+      }
+    }
+  }
+  pub fn add_king_captures(&self, buffer: &mut MoveBuffer, move_mask: u64) {
+    let offset = 6 * self.side_to_move as usize;
+    let mut kings: u64 = self.bitboards[5 + offset];
+    let opponents = self.occupancy[1 - self.side_to_move as usize];
+    while kings != 0 {
+      let next_sq: u32 = pop_lsb(&mut kings);
+      let mut attacks: u64 = self.get_pseudo_king_moves(next_sq) & opponents & move_mask;
+      attacks = self.get_pin_masked_moves(attacks, next_sq);
+
+      while attacks != 0 {
+        let to_sq = pop_lsb(&mut attacks);
+        buffer.add(BitMove::capture(
+          next_sq as u8,
+          to_sq as u8,
+          None
+        ));
+      }
+    }
+  }
+  pub fn add_king_castles(&self, buffer: &mut MoveBuffer, move_mask: u64) {
+    if self.castling_rights & (0b11 << (2 - 2 * self.side_to_move)) == 0 {
+      return;
+    }
+    
+    let offset = 5 + 6 * self.side_to_move as u8;
+    let castle_offset = 2 - 2 * self.side_to_move as u8;
+    let castling_rights = self.castling_rights & 3 << castle_offset;
+    let occupied = self.occupancy[2];
+    let king_sq = self.bitboards[offset as usize].trailing_zeros();
+      
+    let queenside_mask = 0b111 << (king_sq - 3);
+    let kingside_mask = 0b11 << (king_sq + 1);
+
+    if (castling_rights & 1 << castle_offset) != 0
+        && queenside_mask & occupied == 0
+        && !move_mask & 0b11 << (king_sq - 2) == 0
+        && !self.is_square_attacked(king_sq - 2) {
+      buffer.add(BitMove::castle(
+        king_sq as u8,
+        (king_sq - 2) as u8
+      ));
+    }
+    if (castling_rights & 2 << castle_offset) != 0
+        && kingside_mask & occupied == 0
+        && !move_mask & 0b11 << (king_sq + 1) == 0
+        && !self.is_square_attacked(king_sq + 2) {
+      buffer.add(BitMove::castle(
+        king_sq as u8,
+        (king_sq + 2) as u8
+      ));
+    }
+    
+  }
+}

engine/src/bitboard/movegen/knights.rs

@@ -0,0 +1,55 @@
+use super::*;
+
+impl Board {
+
+  pub fn add_knight_moves(&self, capture_buffer: &mut MoveBuffer, quiet_buffer: &mut MoveBuffer, move_mask: u64) {
+    let piece_index = 1 + self.side_to_move * 6;
+    let mut knights = self.bitboards[piece_index as usize];
+    let empty = !self.occupancy[2];
+    let opponents = self.occupancy[1 - self.side_to_move as usize];
+    while knights != 0 {
+      let from_sq = pop_lsb(&mut knights);
+      let raw_move_map = self.get_pseudo_knight_moves(from_sq) & move_mask;
+      let move_map = self.get_pin_masked_moves(raw_move_map, from_sq);
+
+      let mut quiet_map = move_map & empty;
+      let mut capture_map = move_map & opponents;
+
+      while quiet_map != 0 {
+        let to_sq = pop_lsb(&mut quiet_map);
+        quiet_buffer.add(BitMove::quiet(
+          from_sq as u8,
+          to_sq as u8,
+          None
+        ));
+      }
+      while capture_map != 0 {
+        let to_sq = pop_lsb(&mut capture_map);
+        capture_buffer.add(BitMove::capture(
+          from_sq as u8,
+          to_sq as u8,
+          None
+        ));
+      }
+    }
+  }
+  pub fn add_knight_captures(&self, buffer: &mut MoveBuffer, move_mask: u64) {
+    let offset = 6 * self.side_to_move as usize;
+    let mut knights: u64 = self.bitboards[1 + offset];
+    let opponents = self.occupancy[1 - self.side_to_move as usize];
+    while knights != 0 {
+      let next_sq: u32 = pop_lsb(&mut knights);
+      let mut attacks: u64 = self.get_pseudo_knight_moves(next_sq) & opponents & move_mask;
+      attacks = self.get_pin_masked_moves(attacks, next_sq);
+
+      while attacks != 0 {
+        let to_sq = pop_lsb(&mut attacks);
+        buffer.add(BitMove::capture(
+          next_sq as u8,
+          to_sq as u8,
+          None
+        ));
+      }
+    }
+  }
+}

engine/src/bitboard/movegen/pawns.rs

@@ -0,0 +1,76 @@
+use super::*;
+
+impl Board {
+
+  pub fn add_pawn_quiets(&self, buffer: &mut MoveBuffer, move_mask: u64) {
+    let offset: u8 = self.side_to_move * 6;
+    let mut pawns: u64 = self.bitboards[offset as usize];
+    while pawns != 0 {
+      let next_sq = pop_lsb(&mut pawns);
+
+      let mut quiets: u64 = self.get_pseudo_pawn_moves(next_sq) & move_mask;
+      quiets = self.get_pin_masked_moves(quiets, next_sq);
+      while quiets != 0 {
+        let to_sq = quiets.trailing_zeros();
+
+        if (self.side_to_move == 0 && quiets.trailing_zeros() / 8 == 7)
+        || (self.side_to_move == 1 && quiets.trailing_zeros() / 8 == 0) {
+          for piece_type in [4, 3, 2, 1] {
+            buffer.add(BitMove::quiet(
+              next_sq as u8,
+              to_sq as u8,
+              Some(piece_type)
+            ));
+          }
+        }
+        else {
+          buffer.add(BitMove::quiet(
+            next_sq as u8,
+            to_sq as u8,
+            None
+          ));
+        }
+        quiets &= !(1 << to_sq);
+      }
+    }
+  }
+  pub fn add_pawn_captures(&self, buffer: &mut MoveBuffer, move_mask: u64) {
+    let offset = 6 * self.side_to_move as usize;
+    let mut pawns: u64 = self.bitboards[offset];
+    let opponents = self.occupancy[1 - self.side_to_move as usize];
+    while pawns != 0 {
+      let next_sq = pop_lsb(&mut pawns);
+
+      let mut attacks: u64 = self.get_pseudo_pawn_captures(next_sq) & move_mask;
+      attacks = self.get_pin_masked_moves(attacks, next_sq);
+      attacks &= opponents;
+
+      while attacks != 0 {
+        let to_sq = attacks.trailing_zeros();
+
+        if (self.side_to_move == 0 && attacks.trailing_zeros() / 8 == 7)
+        || (self.side_to_move == 1 && attacks.trailing_zeros() / 8 == 0) {
+          for piece_type in [4, 3, 2, 1] {
+            buffer.add(BitMove::capture(
+              next_sq as u8,
+              to_sq as u8,
+              Some(piece_type)
+            ));
+          }
+        }
+        else {
+          buffer.add(BitMove::capture(
+            next_sq as u8,
+            to_sq as u8,
+            None
+          ));
+        }
+        attacks &= !(1 << to_sq);
+      }
+    }
+  }
+  pub fn add_pawn_moves(&self, capture_buffer: &mut MoveBuffer, quiet_buffer: &mut MoveBuffer, move_mask: u64) {
+    self.add_pawn_captures(capture_buffer, move_mask);
+    self.add_pawn_quiets(quiet_buffer, move_mask);
+  }
+}

engine/src/bitboard/movegen/queens.rs

@@ -0,0 +1,55 @@
+use super::*;
+
+impl Board {
+
+  pub fn add_queen_moves(&self, capture_buffer: &mut MoveBuffer, quiet_buffer: &mut MoveBuffer, move_mask: u64) {
+    let piece_index = 4 + self.side_to_move * 6;
+    let mut queens = self.bitboards[piece_index as usize];
+    let empty = !self.occupancy[2];
+    let opponents = self.occupancy[1 - self.side_to_move as usize];
+    while queens != 0 {
+      let from_sq = pop_lsb(&mut queens);
+      let raw_move_map = self.get_pseudo_queen_moves(from_sq) & move_mask;
+      let move_map = self.get_pin_masked_moves(raw_move_map, from_sq);
+
+      let mut quiet_map = move_map & empty;
+      let mut capture_map = move_map & opponents;
+
+      while quiet_map != 0 {
+        let to_sq = pop_lsb(&mut quiet_map);
+        quiet_buffer.add(BitMove::quiet(
+          from_sq as u8,
+          to_sq as u8,
+          None
+        ));
+      }
+      while capture_map != 0 {
+        let to_sq = pop_lsb(&mut capture_map);
+        capture_buffer.add(BitMove::capture(
+          from_sq as u8,
+          to_sq as u8,
+          None
+        ));
+      }
+    }
+  }
+  pub fn add_queen_captures(&self, buffer: &mut MoveBuffer, move_mask: u64) {
+    let offset = 6 * self.side_to_move as usize;
+    let mut queens: u64 = self.bitboards[4 + offset];
+    let opponents = self.occupancy[1 - self.side_to_move as usize];
+    while queens != 0 {
+      let next_sq: u32 = pop_lsb(&mut queens);
+      let mut attacks: u64 = self.get_pseudo_queen_moves(next_sq) & opponents & move_mask;
+      attacks = self.get_pin_masked_moves(attacks, next_sq);
+
+      while attacks != 0 {
+        let to_sq = pop_lsb(&mut attacks);
+        buffer.add(BitMove::capture(
+          next_sq as u8,
+          to_sq as u8,
+          None
+        ));
+      }
+    }
+  }
+}

engine/src/bitboard/movegen/rooks.rs

@@ -0,0 +1,55 @@
+use super::*;
+
+impl Board {
+
+  pub fn add_rook_moves(&self, capture_buffer: &mut MoveBuffer, quiet_buffer: &mut MoveBuffer, move_mask: u64) {
+    let piece_index = 3 + self.side_to_move * 6;
+    let mut rooks = self.bitboards[piece_index as usize];
+    let empty = !self.occupancy[2];
+    let opponents = self.occupancy[1 - self.side_to_move as usize];
+    while rooks != 0 {
+      let from_sq = pop_lsb(&mut rooks);
+      let raw_move_map = self.get_pseudo_rook_moves(from_sq) & move_mask;
+      let move_map = self.get_pin_masked_moves(raw_move_map, from_sq);
+
+      let mut quiet_map = move_map & empty;
+      let mut capture_map = move_map & opponents;
+
+      while quiet_map != 0 {
+        let to_sq = pop_lsb(&mut quiet_map);
+        quiet_buffer.add(BitMove::quiet(
+          from_sq as u8,
+          to_sq as u8,
+          None
+        ));
+      }
+      while capture_map != 0 {
+        let to_sq = pop_lsb(&mut capture_map);
+        capture_buffer.add(BitMove::capture(
+          from_sq as u8,
+          to_sq as u8,
+          None
+        ));
+      }
+    }
+  }
+  pub fn add_rook_captures(&self, buffer: &mut MoveBuffer, move_mask: u64) {
+    let offset = 6 * self.side_to_move as usize;
+    let mut rooks: u64 = self.bitboards[3 + offset];
+    let opponents = self.occupancy[1 - self.side_to_move as usize];
+    while rooks != 0 {
+      let next_sq: u32 = pop_lsb(&mut rooks);
+      let mut attacks: u64 = self.get_pseudo_rook_moves(next_sq) & opponents & move_mask;
+      attacks = self.get_pin_masked_moves(attacks, next_sq);
+
+      while attacks != 0 {
+        let to_sq = pop_lsb(&mut attacks);
+        buffer.add(BitMove::capture(
+          next_sq as u8,
+          to_sq as u8,
+          None
+        ));
+      }
+    }
+  }
+}

engine/src/bitboard/utils.rs

@@ -0,0 +1,125 @@
+#[inline(always)]
+pub fn pop_lsb(value: &mut u64) -> u32 {
+  let idx = value.trailing_zeros();
+  *value &= !(1 << idx);
+  return idx;
+}
+
+#[inline(always)]
+pub fn pop_msb(value: &mut u64) -> u32 {
+  let idx = 63 - value.leading_zeros();
+  *value &= !(1 << idx);
+  return idx;
+}
+
+const RANK_NUMBERS: [char; 8] = ['1', '2', '3', '4', '5', '6', '7', '8'];
+const FILE_LETTERS: [char; 8] = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'];
+pub fn notation_from_square_number(sq: u8) -> String {
+  let row = sq / 8;
+  let col = sq % 8;
+  let mut notation = String::new();
+
+  let row_not = RANK_NUMBERS[row as usize];
+  let col_not = FILE_LETTERS[col as usize];
+
+  notation.push(col_not);
+  notation.push(row_not);
+  return notation;
+}
+
+pub fn try_get_square_number_from_notation(notation: &str) -> Result<u8, ()> {
+
+  let file = match notation.chars().nth(0).unwrap() {
+    'a' => 0,
+    'b' => 1,
+    'c' => 2,
+    'd' => 3,
+    'e' => 4,
+    'f' => 5,
+    'g' => 6,
+    'h' => 7,
+     _  => { return Result::Err(()); }
+  };
+  if let Some(rank) = notation.chars().nth(1) {
+    return Result::Ok(file + 8 * (rank.to_digit(10).unwrap() as u8) - 8);
+  }
+  else {
+    return Result::Err(());
+  }
+}
+
+const PIECE_CHARACTERS: [char; 12] = ['P', 'N', 'B', 'R', 'Q', 'K', 'p', 'n', 'b', 'r', 'q', 'k'];
+pub fn get_character_by_piece_id(id: u8) -> char {
+  return PIECE_CHARACTERS[id as usize];
+}
+
+
+// <----- TESTS ----->
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+
+  #[test]
+  fn pop_lsb_test() {
+
+    // test setup
+    let test_values: [u64; 6] = [
+      0x8000_0000_0000_0000,
+      0x4E91_CF05_713E_451B,
+      0xD588_2D58_6962_34B0,
+      0x9581_3335_DCAB_1DD4,
+      0xBEAC_DBE0_903A_AC00,
+      0x01E8_C895_A6F0_0000
+    ];
+    let expected_values: [u32; 6] = [63, 0, 4, 2, 10, 20];
+
+    // tests
+    for index in 0..6 {
+      let mut test_value = test_values[index];
+      assert_eq!(pop_lsb(&mut test_value), expected_values[index])
+    }
+  }
+
+  #[test]
+  fn pop_msb_test() {
+    // test setup
+    let test_values: [u64; 6] = [
+      0x86D6_8EB0_96A8_8D1C,
+      0x0000_0000_0000_0001,
+      0x3809_24AF_A7AE_8129,
+      0x0277_DA36_3B31_86D9,
+      0x0000_C1C3_201C_0DB1,
+      0x0000_0203_0DE4_E944
+    ];
+    let expected_values: [u32; 6] = [63, 0, 61, 57, 47, 41];
+
+    // tests
+    for index in 0..6 {
+      let mut test_value = test_values[index];
+      assert_eq!(pop_msb(&mut test_value), expected_values[index])
+    }
+  }
+
+  #[test]
+  fn notation_from_square_number_test() {
+    // test setup
+    let square_indices: [u8; 8] = [1, 12, 22, 27, 32, 47, 53, 58];
+    let notations: [String; 8] = [
+      String::from("b1"),
+      String::from("e2"),
+      String::from("g3"),
+      String::from("d4"),
+      String::from("a5"),
+      String::from("h6"),
+      String::from("f7"),
+      String::from("c8")
+    ];
+
+    // tests
+    for index in 0..8 {
+      let notation = notation_from_square_number(square_indices[index].clone());
+      assert_eq!(notation, notations[index]);
+    }
+  }
+}

engine/src/boardsquare.rs

@@ -0,0 +1,31 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize)]
+pub struct BoardSquare {
+    pub x: usize,
+    pub y: usize,
+}
+
+impl BoardSquare {
+    pub fn new() -> Self {
+        return Self { x: 0, y: 0 };
+    }
+
+    pub fn from_coord(x: usize, y: usize) -> Self {
+        #[cfg(debug_assertions)]
+        {
+            if x > 7 {
+                println!(
+                    "Warning: x coordinate of square is bigger than 7, it might not be on the board!"
+                );
+            }
+            if y > 7 {
+                println!(
+                    "Warning: y coordinate of square is bigger than 7, it might not be on the board!"
+                );
+            }
+        }
+        return Self { x: x, y: y };
+    }
+}
+

engine/src/chessmove.rs

@@ -0,0 +1,71 @@
+use crate::piecetype;
+
+use super::boardsquare::BoardSquare;
+use super::movetype::MoveType;
+use super::piecetype::PieceType;
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize)]
+pub struct ChessMove {
+    pub move_type: MoveType,
+    pub piece_type: PieceType,
+    pub from_square: BoardSquare,
+    pub to_square: BoardSquare,
+    pub rook_from: BoardSquare,
+    pub rook_to: BoardSquare,
+    pub promotion_piece: Option<PieceType>,
+}
+
+impl ChessMove {
+    pub fn quiet(
+        piece_type: PieceType,
+        from_square: BoardSquare,
+        to_square: BoardSquare,
+        promotion_piece: Option<PieceType>,
+    ) -> Self {
+        return Self {
+            move_type: MoveType::Quiet,
+            piece_type: piece_type,
+            from_square: from_square,
+            to_square: to_square,
+            rook_from: BoardSquare::new(),
+            rook_to: BoardSquare::new(),
+            promotion_piece: promotion_piece,
+        };
+    }
+
+    pub fn capture(
+        piece_type: PieceType,
+        from_square: BoardSquare,
+        to_square: BoardSquare,
+        promotion_piece: Option<PieceType>,
+    ) -> Self {
+        return Self {
+            move_type: MoveType::Capture,
+            piece_type: piece_type,
+            from_square: from_square,
+            to_square: to_square,
+            rook_from: BoardSquare::new(),
+            rook_to: BoardSquare::new(),
+            promotion_piece: promotion_piece,
+        };
+    }
+
+    pub fn castle(
+        piece_type: PieceType,
+        from_square: BoardSquare,
+        to_square: BoardSquare,
+        rook_from: BoardSquare,
+        rook_to: BoardSquare,
+    ) -> Self {
+        return Self {
+            move_type: MoveType::Quiet,
+            piece_type: piece_type,
+            from_square: from_square,
+            to_square: to_square,
+            rook_from: rook_from,
+            rook_to: rook_to,
+            promotion_piece: None,
+        };
+    }
+}

engine/src/gameend.rs

@@ -0,0 +1,6 @@
+
+pub enum GameEnd {
+  WhiteWon(String),
+  BlackWon(String),
+  Draw(String)
+}

engine/src/lib.rs

@@ -0,0 +1,24 @@
+mod bitboard;
+pub mod chessmove;
+pub mod piecetype;
+pub mod boardsquare;
+pub mod movetype;
+pub mod gameend;
+
+use chessmove::ChessMove;
+use gameend::GameEnd;
+
+pub fn get_available_moves(fen: &str) -> Vec<ChessMove> {
+  println!("get_available_moves answered");
+  return vec![];
+}
+
+pub fn is_game_over(fen: &str) -> Option<GameEnd> {
+  println!("is_game_over answered");
+  return None;
+}
+
+pub fn get_board_after_move(fen: &str, chess_move: &ChessMove) -> String {
+  println!("get_board_after_move answered");
+  return String::from("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1");
+}

engine/src/movetype.rs

@@ -0,0 +1,11 @@
+use serde::Deserialize;
+use serde::Serialize;
+
+#[derive(Serialize, Deserialize)]
+pub enum MoveType {
+    Quiet,
+    Capture,
+    Castle,
+    EnPassant,
+}
+

engine/src/piecetype.rs

@@ -0,0 +1,18 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize)]
+pub enum PieceType {
+    WhitePawn,
+    WhiteKnight,
+    WhiteBishop,
+    WhiteRook,
+    WhiteQueen,
+    WhiteKing,
+    BlackPawn,
+    BlackKnight,
+    BlackBishop,
+    BlackRook,
+    BlackQueen,
+    BlackKing,
+}
+

server/Cargo.toml

@@ -4,3 +4,19 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+tokio = { version = "1", features = ["full"] }
+tokio-tungstenite = "0.21"
+tungstenite = "0.21"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+futures-util = "0.3.31"
+url = "2.5.7"
+uuid = {version = "1.18.1", features = ["v4", "serde"] }
+anyhow = "1.0.100"
+rand = "0.9.2"
+engine = {path = "../engine/"}
+
+
+[[bin]]
+name = "client"
+path = "src/bin/client.rs"

server/src/bin/client.rs

@@ -0,0 +1,195 @@
+use futures_util::{SinkExt, StreamExt};
+use serde::{Deserialize, Serialize};
+use std::io::{self, Write};
+use tokio_tungstenite::{connect_async, tungstenite::Message};
+use url::Url;
+
+#[derive(Serialize, Deserialize, Debug)]
+#[serde(tag = "type")]
+enum ClientMessage {
+    Join { username: String },
+    FindMatch,
+    Move { from: String, to: String },
+    Resign,
+    Chat { text: String },
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+struct ServerMessage {
+    #[serde(rename = "type")]
+    message_type: String,
+    player_id: Option<String>,
+    match_id: Option<String>,
+    opponent: Option<String>,
+    color: Option<String>,
+    reason: Option<String>,
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    println!("Knightly Chess Client");
+    println!("========================");
+
+    // Get server address from user
+    print!("Enter server address [ws://127.0.0.1:9001]: ");
+    io::stdout().flush()?;
+    let mut server_addr = String::new();
+    io::stdin().read_line(&mut server_addr)?;
+    let server_addr = server_addr.trim();
+    let server_addr = if server_addr.is_empty() {
+        "ws://127.0.0.1:9001".to_string()
+    } else {
+        server_addr.to_string()
+    };
+
+    // Connect to server
+    println!("Connecting to {}...", server_addr);
+    let url = Url::parse(&server_addr)?;
+    let (ws_stream, _) = connect_async(url).await?;
+    println!("Connected to server!");
+
+    let (mut write, mut read) = ws_stream.split();
+
+    // Spawn a task to handle incoming messages
+    let read_handle = tokio::spawn(async move {
+        while let Some(message) = read.next().await {
+            match message {
+                Ok(msg) => {
+                    if msg.is_text() {
+                        let text = msg.to_text().unwrap();
+                        println!("\nServer: {}", text);
+
+                        // Try to parse as structured message
+                        if let Ok(parsed) = serde_json::from_str::<ServerMessage>(text) {
+                            match parsed.message_type.as_str() {
+                                "welcome" => {
+                                    if let Some(player_id) = parsed.player_id {
+                                        println!("Welcome! Your player ID: {}", player_id);
+                                    }
+                                }
+                                _ => {
+                                    println!("cucc: {:?}", parsed);
+                                }
+                            }
+                        }
+                    }
+                }
+                Err(e) => {
+                    eprintln!("Error receiving message: {}", e);
+                    break;
+                }
+            }
+        }
+    });
+
+    // Main loop for sending messages
+    println!("\nAvailable commands:");
+    println!("  join <username>    - Join the server");
+    println!("  findmatch          - Find a match");
+    println!("  move <from> <to>   - Make a move (e.g., move e2 e4)");
+    println!("  chat <message>     - Send chat message");
+    println!("  resign             - Resign from current game");
+    println!("  quit               - Exit client");
+    println!();
+
+    loop {
+        print!("➡️  Enter command: ");
+        io::stdout().flush()?;
+
+        let mut input = String::new();
+        io::stdin().read_line(&mut input)?;
+        let input = input.trim();
+
+        if input.is_empty() {
+            continue;
+        }
+
+        let parts: Vec<&str> = input.split_whitespace().collect();
+        let command = parts[0].to_lowercase();
+
+        match command.as_str() {
+            "quit" | "exit" => {
+                println!("👋 Goodbye!");
+                break;
+            }
+            "join" => {
+                if parts.len() >= 2 {
+                    let username = parts[1..].join(" ");
+                    let message = ClientMessage::Join { username };
+                    send_message(&mut write, &message).await?;
+                } else {
+                    println!("Usage: join <username>");
+                }
+            }
+            "findmatch" | "find" => {
+                let message = ClientMessage::FindMatch;
+                send_message(&mut write, &message).await?;
+                println!("🔍 Searching for a match...");
+            }
+            "move" => {
+                if parts.len() >= 3 {
+                    let from = parts[1].to_string();
+                    let to = parts[2].to_string();
+                    let message = ClientMessage::Move { from, to };
+                    send_message(&mut write, &message).await?;
+                    println!("♟️  Sent move: {} -> {}", parts[1], parts[2]);
+                } else {
+                    println!("Usage: move <from> <to> (e.g., move e2 e4)");
+                }
+            }
+            "chat" => {
+                if parts.len() >= 2 {
+                    let text = parts[1..].join(" ");
+                    let message = ClientMessage::Chat { text };
+                    send_message(&mut write, &message).await?;
+                } else {
+                    println!("Usage: chat <message>");
+                }
+            }
+            "resign" => {
+                let message = ClientMessage::Resign;
+                send_message(&mut write, &message).await?;
+                println!("Resigned from current game");
+            }
+            "help" => {
+                print_help();
+            }
+            _ => {
+                println!(
+                    "Unknown command: {}. Type 'help' for available commands.",
+                    command
+                );
+            }
+        }
+    }
+
+    // Cleanup
+    read_handle.abort();
+    Ok(())
+}
+
+async fn send_message(
+    write: &mut futures_util::stream::SplitSink<
+        tokio_tungstenite::WebSocketStream<
+            tokio_tungstenite::MaybeTlsStream<tokio::net::TcpStream>,
+        >,
+        Message,
+    >,
+    message: &ClientMessage,
+) -> Result<(), Box<dyn std::error::Error>> {
+    let json = serde_json::to_string(message)?;
+    write.send(Message::Text(json)).await?;
+    Ok(())
+}
+
+fn print_help() {
+    println!("\n📖 Available Commands:");
+    println!("  join <username>    - Register with a username");
+    println!("  findmatch          - Enter matchmaking queue");
+    println!("  move <from> <to>   - Make a chess move");
+    println!("  chat <message>     - Send chat to opponent");
+    println!("  resign             - Resign from current game");
+    println!("  help               - Show this help");
+    println!("  quit               - Exit the client");
+    println!();
+}

server/src/connection.rs

@@ -0,0 +1,279 @@
+use crate::connection::ClientEvent::*;
+use engine::get_available_moves;
+use futures_util::{SinkExt, StreamExt};
+use serde::{Deserialize, Serialize};
+use std::collections::{HashMap, VecDeque};
+use std::sync::Arc;
+use tokio::net::TcpStream;
+use tokio::sync::Mutex;
+use tokio_tungstenite::{WebSocketStream, tungstenite::Message};
+use uuid::Uuid;
+
+// Type definitions
+pub type Tx = futures_util::stream::SplitSink<WebSocketStream<TcpStream>, Message>;
+pub type ConnectionMap = Arc<Mutex<HashMap<Uuid, PlayerConnection>>>;
+pub type MatchMap = Arc<Mutex<HashMap<Uuid, GameMatch>>>;
+pub type WaitingQueue = Arc<Mutex<VecDeque<Uuid>>>;
+
+// Helper functions to create new instances
+pub fn new_connection_map() -> ConnectionMap {
+    Arc::new(Mutex::new(HashMap::new()))
+}
+
+pub fn new_match_map() -> MatchMap {
+    Arc::new(Mutex::new(HashMap::new()))
+}
+
+pub fn new_waiting_queue() -> WaitingQueue {
+    Arc::new(Mutex::new(VecDeque::new()))
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct Step {
+    pub from: String,
+    pub to: String,
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+#[serde(tag = "type")]
+enum ClientEvent {
+    Join { username: String },
+    FindMatch,
+    Move { from: String, to: String },
+    Resign,
+    Chat { text: String },
+    RequestLegalMoves { fen: String },
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct EventResponse {
+    pub response: Result<(), String>,
+}
+
+#[derive(Debug)]
+pub struct PlayerConnection {
+    pub id: Uuid,
+    pub username: Option<String>,
+    pub tx: Tx,
+    pub current_match: Option<Uuid>,
+}
+
+#[derive(Debug, Clone)]
+pub struct GameMatch {
+    pub id: Uuid,
+    pub player_white: Uuid,
+    pub player_black: Uuid,
+    pub board_state: String,
+    pub move_history: Vec<String>,
+}
+
+// Message sending utilities
+pub async fn send_message_to_player(
+    connections: &ConnectionMap,
+    player_id: Uuid,
+    message: &str,
+) -> Result<(), Box<dyn std::error::Error>> {
+    let mut connections_lock = connections.lock().await;
+    if let Some(connection) = connections_lock.get_mut(&player_id) {
+        connection
+            .tx
+            .send(Message::Text(message.to_string()))
+            .await?;
+    }
+    Ok(())
+}
+
+pub async fn broadcast_to_all(connections: &ConnectionMap, message: &str) {
+    let mut connections_lock = connections.lock().await;
+    let mut dead_connections = Vec::new();
+
+    for (id, connection) in connections_lock.iter_mut() {
+        if let Err(e) = connection.tx.send(Message::Text(message.to_string())).await {
+            eprintln!("Failed to send to {}: {}", id, e);
+            dead_connections.push(*id);
+        }
+    }
+
+    // Clean up dead connections
+    for dead_id in dead_connections {
+        connections_lock.remove(&dead_id);
+    }
+}
+
+pub async fn broadcast_to_match(
+    connections: &ConnectionMap,
+    matches: &MatchMap,
+    match_id: Uuid,
+    message: &str,
+) -> Result<(), Box<dyn std::error::Error>> {
+    let matches_lock = matches.lock().await;
+    if let Some(game_match) = matches_lock.get(&match_id) {
+        send_message_to_player(connections, game_match.player_white, message).await?;
+        send_message_to_player(connections, game_match.player_black, message).await?;
+    }
+    Ok(())
+}
+
+// Connection handler
+pub async fn handle_connection(
+    stream: TcpStream,
+    connections: ConnectionMap,
+    matches: MatchMap,
+    waiting_queue: WaitingQueue,
+) -> anyhow::Result<()> {
+    use tokio_tungstenite::accept_async;
+
+    let ws_stream = accept_async(stream).await?;
+    let (write, mut read) = ws_stream.split();
+
+    let player_id = Uuid::new_v4();
+
+    // Store the connection
+    {
+        let mut conn_map = connections.lock().await;
+        conn_map.insert(
+            player_id,
+            PlayerConnection {
+                id: player_id,
+                username: None,
+                tx: write,
+                current_match: None,
+            },
+        );
+    }
+
+    println!("New connection: {}", player_id);
+
+    // Send welcome message
+    let _ = send_message_to_player(
+        &connections,
+        player_id,
+        &format!(r#"{{"type": "welcome", "player_id": "{}"}}"#, player_id),
+    )
+    .await;
+
+    // Message processing loop
+    while let Some(Ok(message)) = read.next().await {
+        if message.is_text() {
+            let text = message.to_text()?;
+            println!("Received from {}: {}", player_id, text);
+
+            let client_data: ClientEvent = serde_json::from_str(text)
+                .expect("Failed to convert data into json at handle_connection");
+
+            println!("client: {:?}", client_data);
+
+            match client_data {
+                Join { username } => {
+                    {
+                        let mut conn_map = connections.lock().await;
+                        let player = conn_map.get_mut(&player_id).unwrap();
+                        player.username = Some(username);
+                    }
+
+                    //respone to client
+                    let response: EventResponse = EventResponse {
+                        response: core::result::Result::Ok(()),
+                    };
+
+                    println!("response: {:?}", response);
+
+                    let _ = send_message_to_player(
+                        &connections,
+                        player_id,
+                        &serde_json::to_string(&response).unwrap(),
+                    )
+                    .await;
+                }
+                FindMatch => {
+                    let mut wait_queue = waiting_queue.lock().await;
+                    wait_queue.push_back(player_id.clone());
+                    println!("Appended {} to the waiting queue", player_id);
+                    println!("queue {:?}", wait_queue);
+                }
+                Move { from, to } => {}
+                RequestLegalMoves { fen } => {
+                    let moves = get_available_moves(&fen);
+                    let _ = send_message_to_player(
+                        &connections,
+                        player_id,
+                        &serde_json::to_string(&moves).unwrap(),
+                    )
+                    .await;
+                    println!("Sent moves to player: {}", player_id);
+                }
+                _ => {}
+            }
+        }
+    }
+
+    // Cleanup on disconnect
+    cleanup_player(player_id, &connections, &matches, &waiting_queue).await;
+    println!("Connection {} closed", player_id);
+
+    Ok(())
+}
+
+async fn cleanup_player(
+    player_id: Uuid,
+    connections: &ConnectionMap,
+    _matches: &MatchMap,
+    waiting_queue: &WaitingQueue,
+) {
+    // Remove from waiting queue
+    waiting_queue.lock().await.retain(|&id| id != player_id);
+
+    // Remove from connections
+    connections.lock().await.remove(&player_id);
+
+    println!("Cleaned up player {}", player_id);
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use uuid::Uuid;
+
+    #[tokio::test]
+    async fn test_send_message_to_nonexistent_player() {
+        let connections = new_connection_map();
+        let player_id = Uuid::new_v4();
+
+        let result = send_message_to_player(&connections, player_id, "test message").await;
+        assert!(result.is_ok(), "Should handle missing player gracefully");
+    }
+
+    #[tokio::test]
+    async fn test_broadcast_to_empty_connections() {
+        let connections = new_connection_map();
+
+        broadcast_to_all(&connections, "test broadcast").await;
+
+        let conn_map = connections.lock().await;
+        assert!(conn_map.is_empty(), "Connections should still be empty");
+    }
+
+    #[tokio::test]
+    async fn test_connection_cleanup() {
+        let connections = new_connection_map();
+        let matches = new_match_map();
+        let waiting_queue = new_waiting_queue();
+
+        let player_id = Uuid::new_v4();
+
+        {
+            waiting_queue.lock().await.push_back(player_id);
+            assert_eq!(waiting_queue.lock().await.len(), 1);
+        }
+
+        cleanup_player(player_id, &connections, &matches, &waiting_queue).await;
+
+        {
+            let queue = waiting_queue.lock().await;
+            assert!(
+                !queue.contains(&player_id),
+                "Player should be removed from waiting queue"
+            );
+        }
+    }
+}

server/src/main.rs

@@ -1,3 +1,43 @@
-fn main() {
-    println!("Hello, world!");
+mod connection;
+mod matchmaking;
+mod messages;
+use tokio::net::TcpListener;
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    let address = "0.0.0.0:9001";
+    let listener = TcpListener::bind(address).await?;
+    println!("Server running on ws://{}", address);
+
+    // Shared state initialization using the new helper functions
+    let connections = connection::new_connection_map();
+    let matches = connection::new_match_map();
+    let waiting_queue = connection::new_waiting_queue();
+
+    // Start matchmaking background task
+    let matchmaker = matchmaking::MatchmakingSystem::new(
+        connections.clone(),
+        matches.clone(),
+        waiting_queue.clone(),
+    );
+    tokio::spawn(async move {
+        matchmaker.run().await;
+    });
+
+    // Main connection loop
+    while let Ok((stream, _)) = listener.accept().await {
+        let connections = connections.clone();
+        let matches = matches.clone();
+        let waiting_queue = waiting_queue.clone();
+
+        tokio::spawn(async move {
+            if let Err(e) =
+                connection::handle_connection(stream, connections, matches, waiting_queue).await
+            {
+                eprintln!("Connection error: {}", e);
+            }
+        });
+    }
+
+    Ok(())
 }

server/src/matchmaking.rs

@@ -0,0 +1,183 @@
+use crate::connection::{ConnectionMap, GameMatch, MatchMap, WaitingQueue};
+use rand::random;
+use uuid::Uuid;
+
+pub struct MatchmakingSystem {
+    connections: ConnectionMap,
+    matches: MatchMap,
+    waiting_queue: WaitingQueue,
+}
+
+impl MatchmakingSystem {
+    pub fn new(connections: ConnectionMap, matches: MatchMap, waiting_queue: WaitingQueue) -> Self {
+        Self {
+            connections,
+            matches,
+            waiting_queue,
+        }
+    }
+
+    pub async fn run(&self) {
+        loop {
+            self.try_create_match().await;
+            tokio::time::sleep(tokio::time::Duration::from_secs(1)).await;
+        }
+    }
+
+    async fn try_create_match(&self) {
+        let mut queue = self.waiting_queue.lock().await;
+
+        while queue.len() >= 2 {
+            let player1 = queue.pop_front().unwrap();
+            let player2 = queue.pop_front().unwrap();
+
+            let match_id = Uuid::new_v4();
+            let (white_player, black_player) = if random::<bool>() {
+                (player1, player2)
+            } else {
+                (player2, player1)
+            };
+
+            let game_match = GameMatch {
+                id: match_id,
+                player_white: white_player,
+                player_black: black_player,
+                board_state: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1".to_string(),
+                move_history: Vec::new(),
+            };
+
+            // Store the match
+            self.matches.lock().await.insert(match_id, game_match);
+
+            // Update player connections
+            {
+                let mut conn_map = self.connections.lock().await;
+                if let Some(player) = conn_map.get_mut(&white_player) {
+                    player.current_match = Some(match_id);
+                }
+                if let Some(player) = conn_map.get_mut(&black_player) {
+                    player.current_match = Some(match_id);
+                }
+            }
+
+            // Notify players
+            self.notify_players(white_player, black_player, match_id)
+                .await;
+        }
+    }
+
+    async fn notify_players(&self, white: Uuid, black: Uuid, match_id: Uuid) {
+        let conn_map = self.connections.lock().await;
+
+        // Get opponent names
+        let white_name = conn_map
+            .get(&black)
+            .and_then(|c| c.username.as_deref())
+            .unwrap_or("Opponent");
+        let black_name = conn_map
+            .get(&white)
+            .and_then(|c| c.username.as_deref())
+            .unwrap_or("Opponent");
+
+        // Notify white player
+        if let Some(_) = conn_map.get(&white) {
+            let message = format!(
+                r#"{{"type": "match_found", "match_id": "{}", "opponent": "{}", "color": "white"}}"#,
+                match_id, black_name
+            );
+            let _ =
+                crate::connection::send_message_to_player(&self.connections, white, &message).await;
+        }
+
+        // Notify black player
+        if let Some(_) = conn_map.get(&black) {
+            let message = format!(
+                r#"{{"type": "match_found", "match_id": "{}", "opponent": "{}", "color": "black"}}"#,
+                match_id, white_name
+            );
+            let _ =
+                crate::connection::send_message_to_player(&self.connections, black, &message).await;
+        }
+
+        println!("Match created: {} (white) vs {} (black)", white, black);
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use uuid::Uuid;
+
+    use crate::connection::new_connection_map;
+    use crate::connection::new_match_map;
+    use crate::connection::new_waiting_queue;
+
+    #[tokio::test]
+    async fn test_matchmaking_creates_matches() {
+        let connections = new_connection_map();
+        let matches = new_match_map();
+        let waiting_queue = new_waiting_queue();
+
+        let matchmaking =
+            MatchmakingSystem::new(connections.clone(), matches.clone(), waiting_queue.clone());
+
+        let player1 = Uuid::new_v4();
+        let player2 = Uuid::new_v4();
+
+        {
+            waiting_queue.lock().await.push_back(player1);
+            waiting_queue.lock().await.push_back(player2);
+        }
+
+        matchmaking.try_create_match().await;
+
+        {
+            let matches_map = matches.lock().await;
+            assert_eq!(matches_map.len(), 1, "Should create one match");
+
+            let game_match = matches_map.values().next().unwrap();
+            assert!(game_match.player_white == player1 || game_match.player_white == player2);
+            assert!(game_match.player_black == player1 || game_match.player_black == player2);
+            assert_ne!(
+                game_match.player_white, game_match.player_black,
+                "Players should be different"
+            );
+        }
+
+        {
+            let queue = waiting_queue.lock().await;
+            assert!(
+                queue.is_empty(),
+                "Waiting queue should be empty after matchmaking"
+            );
+        }
+    }
+
+    #[tokio::test]
+    async fn test_matchmaking_with_odd_players() {
+        let connections = new_connection_map();
+        let matches = new_match_map();
+        let waiting_queue = new_waiting_queue();
+
+        let matchmaking =
+            MatchmakingSystem::new(connections.clone(), matches.clone(), waiting_queue.clone());
+
+        let player1 = Uuid::new_v4();
+        {
+            waiting_queue.lock().await.push_back(player1);
+        }
+
+        matchmaking.try_create_match().await;
+
+        {
+            let matches_map = matches.lock().await;
+            assert!(
+                matches_map.is_empty(),
+                "Should not create match with only one player"
+            );
+
+            let queue = waiting_queue.lock().await;
+            assert_eq!(queue.len(), 1, "Should keep single player in queue");
+        }
+    }
+}

server/src/messages.rs

@@ -0,0 +1,36 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, Debug)]
+#[serde(tag = "type")]
+pub enum ServerMessage {
+    Welcome {
+        player_id: String,
+    },
+    MatchFound {
+        match_id: String,
+        opponent: String,
+        color: String,
+    },
+    GameStart {
+        fen: String,
+        white_time: u32,
+        black_time: u32,
+    },
+    MoveResult {
+        valid: bool,
+        from: String,
+        to: String,
+        new_fen: String,
+    },
+    OpponentMove {
+        from: String,
+        to: String,
+    },
+    GameEnd {
+        result: String,
+        reason: String,
+    },
+    Error {
+        reason: String,
+    },
+}

ui/src/main.rs

@@ -3,7 +3,7 @@ use eframe::egui;
 fn main() -> eframe::Result<()> {
     let options = eframe::NativeOptions{
         viewport: egui::ViewportBuilder::default()
-            .with_fullscreen(false)
+            .with_fullscreen(true)
             .with_min_inner_size(egui::vec2(800.0, 600.0)) // Minimum width, height
             .with_inner_size(egui::vec2(7680.0, 4320.0)), // Initial size
         ..Default::default()
@@ -101,6 +101,7 @@ impl Default for ChessApp {
                 (1920, 1080),
                 (2560, 1440),
                 (3840, 2160),
+                (7680, 4320),
             ],
             selected_resolution: 2, // Default to 1920x1080
             state: AppState::MainMenu,