app/build.gradle

@@ -39,6 +39,10 @@ application {
     applicationName = "3DChess"
 }
 
+run {
+    standardInput = System.in
+}
+
 jar {
     manifest {
         attributes 'Main-Class': application.mainClass

app/src/main/java/chess/SwingMain.java

@@ -1,7 +1,7 @@
 package chess;
 
-import chess.ai.DumbAI;
-import chess.ai.HungryAI;
+import chess.ai.AI;
+import chess.ai.minimax.AlphaBetaAI;
 import chess.controller.CommandExecutor;
 import chess.controller.commands.NewGameCommand;
 import chess.controller.event.GameAdaptator;
@@ -18,11 +18,14 @@ public class SwingMain {
         Window window = new Window(commandExecutor, false);
         commandExecutor.addListener(window);
 
-        DumbAI ai = new DumbAI(commandExecutor, Color.Black);
+        AI ai = new AlphaBetaAI(commandExecutor, Color.Black, 5);
         commandExecutor.addListener(ai);
 
-        HungryAI ai2 = new HungryAI(commandExecutor, Color.White);
-        commandExecutor.addListener(ai2);
+        // AI ai2 = new AlphaBetaAI(commandExecutor, Color.White, 5);
+        // commandExecutor.addListener(ai2);
+
+        // Window window2 = new Window(ai2.getSimulation(), false);
+        // ai2.getSimulation().addListener(window2);
 
         commandExecutor.addListener(new GameAdaptator(){
             @Override

app/src/main/java/chess/ai/AI.java

@@ -4,6 +4,7 @@ import java.util.List;
 
 import chess.controller.Command;
 import chess.controller.CommandExecutor;
+import chess.controller.Command.CommandResult;
 import chess.controller.commands.GetPieceAtCommand;
 import chess.controller.commands.GetPlayerMovesCommand;
 import chess.controller.commands.GetAllowedCastlingsCommand;
@@ -50,8 +51,12 @@ public abstract class AI extends GameAdaptator{
 	}
 
 	protected List<Move> getAllowedMoves() {
+		return getAllowedMoves(this.commandExecutor);
+	}
+
+	protected List<Move> getAllowedMoves(CommandExecutor commandExecutor) {
 		GetPlayerMovesCommand cmd = new GetPlayerMovesCommand();
-		sendCommand(cmd);
+		sendCommand(cmd, commandExecutor);
 		return cmd.getMoves();
 	}
 
@@ -61,8 +66,16 @@ public abstract class AI extends GameAdaptator{
 		return cmd2.getCastlingResult();
 	}
 
-	protected void sendCommand(Command command) {
-		this.commandExecutor.executeCommand(command);
+	protected CommandResult sendCommand(Command command) {
+		return sendCommand(command, this.commandExecutor);
+	}
+
+	protected CommandResult sendCommand(Command command, CommandExecutor commandExecutor) {
+		CommandResult result = commandExecutor.executeCommand(command);
+		if(result == CommandResult.NotAllowed){
+			System.out.println("eeeeee");
+		}
+		return result;
 	}
 	
 }

app/src/main/java/chess/ai/HungryAI.java

@@ -26,7 +26,7 @@ public class HungryAI extends AI {
 
 	private int getMoveCost(Move move) {
 		Piece piece = pieceAt(move.getDeadPieceCoords());
-		return pieceCost.getCost(piece);
+		return - (int) pieceCost.getCost(piece);
 	}
 
 	private List<Move> getBestMoves() {

app/src/main/java/chess/ai/PieceCost.java

@@ -10,51 +10,58 @@ import chess.model.pieces.Pawn;
 import chess.model.pieces.Queen;
 import chess.model.pieces.Rook;
 
-public class PieceCost implements PieceVisitor<Integer> {
+public class PieceCost implements PieceVisitor<Float> {
 
 	private final Color player;
 
+	public static final float BISHOP = 30;
+	public static final float KING = 900;
+	public static final float KNIGHT = 30;
+	public static final float PAWN = 10;
+	public static final float QUEEN = 90;
+	public static final float ROOK = 50;
+
 	public PieceCost(Color color) {
 		this.player = color;
 	}
 
-	public int getCost(Piece piece) {
+	public float getCost(Piece piece) {
 		if (piece == null)
 			return 0;
-		int cost = visit(piece);
-		if (piece.getColor() == player)
+		float cost = visit(piece);
+		if (piece.getColor() != player)
 			cost = -cost;
 		return cost;
 	}
 
 	@Override
-	public Integer visitPiece(Bishop bishop) {
-		return 3;
+	public Float visitPiece(Bishop bishop) {
+		return BISHOP;
 	}
 
 	@Override
-	public Integer visitPiece(King king) {
-		return 90;
+	public Float visitPiece(King king) {
+		return KING;
 	}
 
 	@Override
-	public Integer visitPiece(Knight knight) {
-		return 3;
+	public Float visitPiece(Knight knight) {
+		return KNIGHT;
 	}
 
 	@Override
-	public Integer visitPiece(Pawn pawn) {
-		return 1;
+	public Float visitPiece(Pawn pawn) {
+		return PAWN;
 	}
 
 	@Override
-	public Integer visitPiece(Queen queen) {
-		return 9;
+	public Float visitPiece(Queen queen) {
+		return QUEEN;
 	}
 
 	@Override
-	public Integer visitPiece(Rook rook) {
-		return 5;
+	public Float visitPiece(Rook rook) {
+		return ROOK;
 	}
 
 }

app/src/main/java/chess/ai/PiecePosCost.java

@@ -0,0 +1,129 @@
+package chess.ai;
+
+import java.util.Arrays;
+import java.util.List;
+
+import chess.model.Color;
+import chess.model.Coordinate;
+import chess.model.Piece;
+import chess.model.PieceVisitor;
+import chess.model.pieces.Bishop;
+import chess.model.pieces.King;
+import chess.model.pieces.Knight;
+import chess.model.pieces.Pawn;
+import chess.model.pieces.Queen;
+import chess.model.pieces.Rook;
+
+public class PiecePosCost implements PieceVisitor<List<Float>> {
+
+	private final Color color;
+
+	private static final List<Float> BISHOP = Arrays.asList(
+			-2.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -2.0f, 
+			-1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -1.0f,
+			-1.0f, 0.0f, 0.5f, 1.0f, 1.0f, 0.5f, 0.0f, -1.0f,
+			-1.0f, 0.5f, 0.5f, 1.0f, 1.0f, 0.5f, 0.5f, -1.0f,
+			-1.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f, -1.0f,
+			-1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, -1.0f,
+			-1.0f, 0.5f, 0.0f, 0.0f, 0.0f, 0.0f, 0.5f, -1.0f,
+			-2.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -2.0f);
+
+	private static final List<Float> KING = Arrays.asList(
+			-3.0f, -4.0f, -4.0f, -5.0f, -5.0f, -4.0f, -4.0f, -3.0f,
+			-3.0f, -4.0f, -4.0f, -5.0f, -5.0f, -4.0f, -4.0f, -3.0f,
+			-3.0f, -4.0f, -4.0f, -5.0f, -5.0f, -4.0f, -4.0f, -3.0f,
+			-3.0f, -4.0f, -4.0f, -5.0f, -5.0f, -4.0f, -4.0f, -3.0f,
+			-2.0f, -3.0f, -3.0f, -4.0f, -4.0f, -3.0f, -3.0f, -2.0f,
+			-1.0f, -2.0f, -2.0f, -2.0f, -2.0f, -2.0f, -2.0f, -1.0f,
+			2.0f, 2.0f, 0.0f, 0.0f, 0.0f, 0.0f, 2.0f, 2.0f,
+			2.0f, 3.0f, 1.0f, 0.0f, 0.0f, 1.0f, 3.0f, 2.0f);
+
+	private static final List<Float> KNIGHT = Arrays.asList(
+			-5.0f, -4.0f, -3.0f, -3.0f, -3.0f, -3.0f, -4.0f, -5.0f, 
+			-4.0f, -2.0f, 0.0f, 0.0f, 0.0f, 0.0f, -2.0f, -4.0f,
+			-3.0f, 0.0f, 1.0f, 1.5f, 1.5f, 1.0f, 0.0f, -3.0f,
+			-3.0f, 0.5f, 1.5f, 2.0f, 2.0f, 1.5f, 0.5f, -3.0f,
+			-3.0f, 0.0f, 1.5f, 2.0f, 2.0f, 1.5f, 0.0f, -3.0f,
+			-3.0f, 0.5f, 1.0f, 1.5f, 1.5f, 1.0f, 0.5f, -3.0f,
+			-4.0f, -2.0f, 0.0f, 0.5f, 0.5f, 0.0f, -2.0f, -4.0f,
+			-5.0f, -4.0f, -3.0f, -3.0f, -3.0f, -3.0f, -4.0f, -5.0f);
+
+	private static final List<Float> PAWN = Arrays.asList(
+			0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
+			5.0f, 5.0f, 5.0f, 5.0f, 5.0f, 5.0f, 5.0f, 5.0f,
+			1.0f, 1.0f, 2.0f, 3.0f, 3.0f, 2.0f, 1.0f, 1.0f,
+			0.5f, 0.5f, 1.0f, 2.5f, 2.5f, 1.0f, 0.5f, 0.5f,
+			0.0f, 0.0f, 1.0f, 2.0f, 2.0f, 1.0f, 0.0f, 0.0f,
+			0.5f, -0.5f, -1.0f, 0.0f, 0.0f, -1.0f, -0.5f, 0.5f,
+			0.5f, 1.0f, 1.0f, -2.0f, -2.0f, 1.0f, 1.0f, 0.5f,
+			0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f);
+
+	private static final List<Float> QUEEN = Arrays.asList(
+			-2.0f, -1.0f, -1.0f, -0.5f, -0.5f, -1.0f, -1.0f, -2.0f,
+			-1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -1.0f,
+			-1.0f, 0.0f, 0.5f, 0.5f, 0.5f, 0.5f, 0.0f, -1.0f,
+			-0.5f, 0.0f, 0.5f, 0.5f, 0.5f, 0.5f, 0.0f, -0.5f,
+			0.0f, 0.0f, 0.5f, 0.5f, 0.5f, 0.5f, 0.0f, -0.5f,
+			-1.0f, 0.5f, 0.5f, 0.5f, 0.5f, 0.5f, 0.0f, -1.0f,
+			-1.0f, 0.0f, 0.5f, 0.0f, 0.0f, 0.0f, 0.0f, -1.0f,
+			-2.0f, -1.0f, -1.0f, -0.5f, -0.5f, -1.0f, -1.0f, -2.0f);
+
+	private static final List<Float> ROOK = Arrays.asList(
+			0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
+			0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 0.5f,
+			-0.5f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.5f,
+			-0.5f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.5f,
+			-0.5f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.5f,
+			-0.5f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.5f,
+			-0.5f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.5f,
+			0.0f, 0.0f, 0.0f, 0.5f, 0.5f, 0.0f, 0.0f, 0.0f);
+
+	public PiecePosCost(Color color) {
+		this.color = color;
+	}
+
+	public float getEvaluation(Piece piece, Coordinate coordinate) {
+		if (piece == null)
+			return 0;
+		List<Float> positions = visit(piece);
+		int x = piece.getColor() == Color.Black ? (Coordinate.VALUE_MAX - 1 - coordinate.getX()) : coordinate.getX();
+		int y = piece.getColor() == Color.Black ? (Coordinate.VALUE_MAX - 1 - coordinate.getY()) : coordinate.getY();
+		Coordinate newCoords = new Coordinate(x, y);
+		assert newCoords.isValid();
+		float result = positions.get(newCoords.toIndex());
+		if (piece.getColor() != color)
+			return -result;
+		return result;
+	}
+
+	@Override
+	public List<Float> visitPiece(Bishop bishop) {
+		return BISHOP;
+	}
+
+	@Override
+	public List<Float> visitPiece(King king) {
+		return KING;
+	}
+
+	@Override
+	public List<Float> visitPiece(Knight knight) {
+		return KNIGHT;
+	}
+
+	@Override
+	public List<Float> visitPiece(Pawn pawn) {
+		return PAWN;
+	}
+
+	@Override
+	public List<Float> visitPiece(Queen queen) {
+		return QUEEN;
+	}
+
+	@Override
+	public List<Float> visitPiece(Rook rook) {
+		return ROOK;
+	}
+
+}

app/src/main/java/chess/ai/minimax/AlphaBetaAI.java

@@ -0,0 +1,89 @@
+package chess.ai.minimax;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+
+import chess.ai.AI;
+import chess.controller.CommandExecutor;
+import chess.controller.commands.MoveCommand;
+import chess.controller.commands.PromoteCommand;
+import chess.controller.commands.PromoteCommand.PromoteType;
+import chess.model.Color;
+import chess.model.Coordinate;
+import chess.model.Move;
+
+public class AlphaBetaAI extends AI {
+
+	private final int searchDepth;
+	
+	private static final float MAX_FLOAT = Float.MAX_VALUE;
+	private static final float MIN_FLOAT = -MAX_FLOAT;
+
+	private final ExecutorService threadPool;
+
+	public AlphaBetaAI(CommandExecutor commandExecutor, Color color, int searchDepth) {
+		super(commandExecutor, color);
+		this.searchDepth = searchDepth;
+		int threadCount = Runtime.getRuntime().availableProcessors();
+		this.threadPool = Executors.newFixedThreadPool(threadCount, new AlphaBetaThreadCreator(commandExecutor, color, threadCount));
+	}
+
+	private Move getBestMove() {
+		List<Move> moves = getAllowedMoves();
+		List<Future<Float>> moveEvaluations = new ArrayList<>(50);
+		float bestMoveValue = MIN_FLOAT;
+		Move bestMove = null;
+
+		System.out.println("Evaluating " + moves.size() + " moves ...");
+
+		for (Move move : moves) {
+			moveEvaluations.add(this.threadPool.submit(() -> {
+				return AlphaBetaThreadCreator.getMoveValue(move, this.searchDepth);
+			}));
+		}
+
+		for (int i = 0; i < moves.size(); i++) {
+			System.out.printf("Progress : %.2f %%    ", (float) (i) / moves.size() * 100.0f);
+			Move move = moves.get(i);
+			System.out.print("\r");
+			float value = MIN_FLOAT;
+			try {
+				value = moveEvaluations.get(i).get();
+			} catch (InterruptedException | ExecutionException e) {
+				e.printStackTrace();
+			}
+			if (value > bestMoveValue) {
+				bestMoveValue = value;
+				bestMove = move;
+			}
+		}
+
+		System.out.println("Best move : " + bestMoveValue + "                 ");
+
+		return bestMove;
+	}
+
+	@Override
+	public void onGameEnd() {
+		this.threadPool.close();
+	}
+
+	@Override
+	protected void play() {
+		long current = System.currentTimeMillis();
+		Move move = getBestMove();
+		long elapsed = System.currentTimeMillis() - current;
+		System.out.println("Took " + elapsed + "ms");
+		sendCommand(new MoveCommand(move));
+	}
+
+	@Override
+	protected void promote(Coordinate pawnCoords) {
+		sendCommand(new PromoteCommand(PromoteType.Queen));
+	}
+
+}

app/src/main/java/chess/ai/minimax/AlphaBetaThread.java

@@ -0,0 +1,101 @@
+package chess.ai.minimax;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import chess.ai.PieceCost;
+import chess.ai.PiecePosCost;
+import chess.model.ChessBoard;
+import chess.model.Color;
+import chess.model.Coordinate;
+import chess.model.Move;
+import chess.model.Piece;
+
+public class AlphaBetaThread extends Thread {
+
+	private final GameSimulation simulation;
+	private final PieceCost pieceCost;
+	private final PiecePosCost piecePosCost;
+
+	private static final int GREAT_MOVE = 9999;
+
+	private static final float MAX_FLOAT = Float.MAX_VALUE;
+	private static final float MIN_FLOAT = -MAX_FLOAT;
+
+	public AlphaBetaThread(Runnable task, GameSimulation simulation, Color color) {
+		super(task);
+		this.simulation = simulation;
+		this.pieceCost = new PieceCost(color);
+		this.piecePosCost = new PiecePosCost(color);
+	}
+
+	private float getEndGameEvaluation() {
+		Color currentTurn = this.simulation.getPlayerTurn();
+		if (this.simulation.getBoard().isKingInCheck(currentTurn))
+			return GREAT_MOVE;
+		return getBoardEvaluation() - PieceCost.PAWN;
+	}
+
+	private float getBoardEvaluation() {
+		final ChessBoard board = this.simulation.getBoard();
+		float result = 0;
+		for (int i = 0; i < Coordinate.VALUE_MAX; i++) {
+			for (int j = 0; j < Coordinate.VALUE_MAX; j++) {
+				Coordinate coordinate = new Coordinate(i, j);
+				Piece piece = board.pieceAt(coordinate);
+				result += pieceCost.getCost(piece) + piecePosCost.getEvaluation(piece, coordinate);
+			}
+		}
+		return result;
+	}
+
+	public float getMoveValue(Move move, int searchDepth) {
+		this.simulation.tryMove(move);
+		float value = -negaMax(searchDepth - 1, MIN_FLOAT, MAX_FLOAT);
+		this.simulation.undoMove();
+		return value;
+	}
+
+	private float negaMax(int depth, float alpha, float beta) {
+		float value = MIN_FLOAT;
+
+		List<Move> moves = this.simulation.getAllowedMoves();
+
+		if (moves.isEmpty())
+			return -getEndGameEvaluation();
+
+		List<Entry<Move, Float>> movesCost = new ArrayList<>(moves.size());
+
+		for (Move move : moves) {
+			this.simulation.tryMove(move);
+			movesCost.add(Map.entry(move, -getBoardEvaluation()));
+			this.simulation.undoMove();
+		}
+
+		Collections.sort(movesCost, (first, second) -> {
+			return Float.compare(first.getValue(), second.getValue());
+		});
+
+		if (depth == 1)
+			return -movesCost.getFirst().getValue();
+
+		for (var moveEntry : movesCost) {
+			Move move = moveEntry.getKey();
+			this.simulation.tryMove(move);
+			value = Float.max(value, -negaMax(depth - 1, -beta, -alpha));
+			this.simulation.undoMove();
+			alpha = Float.max(alpha, value);
+			if (alpha >= beta)
+				return value;
+		}
+
+		return value;
+	}
+
+	public GameSimulation getSimulation() {
+		return simulation;
+	}
+}

app/src/main/java/chess/ai/minimax/AlphaBetaThreadCreator.java

@@ -0,0 +1,36 @@
+package chess.ai.minimax;
+
+import java.util.concurrent.ThreadFactory;
+
+import chess.controller.CommandExecutor;
+import chess.model.Color;
+import chess.model.Move;
+
+public class AlphaBetaThreadCreator implements ThreadFactory{
+
+	private final Color color;
+	private final GameSimulation simulations[];
+	private int currentThread = 0;
+
+	public AlphaBetaThreadCreator(CommandExecutor commandExecutor, Color color, int threadCount) {
+		this.color = color;
+		simulations = new GameSimulation[threadCount];
+		for (int i = 0; i < threadCount; i++) {
+			simulations[i] = new GameSimulation();
+			commandExecutor.addListener(simulations[i]);
+		}
+	}
+
+	public static float getMoveValue(Move move, int searchDepth) {
+		AlphaBetaThread t = (AlphaBetaThread) Thread.currentThread();
+		return t.getMoveValue(move, searchDepth);
+	}
+
+	@Override
+	public Thread newThread(Runnable r) {
+		AlphaBetaThread t = new AlphaBetaThread(r, simulations[currentThread], color);
+		currentThread++;
+		return t;
+	}
+	
+}

app/src/main/java/chess/ai/minimax/GameSimulation.java

@@ -0,0 +1,103 @@
+package chess.ai.minimax;
+
+import java.util.List;
+
+import chess.controller.Command;
+import chess.controller.Command.CommandResult;
+import chess.controller.CommandExecutor;
+import chess.controller.commands.CastlingCommand;
+import chess.controller.commands.GetPlayerMovesCommand;
+import chess.controller.commands.MoveCommand;
+import chess.controller.commands.NewGameCommand;
+import chess.controller.commands.PromoteCommand;
+import chess.controller.commands.UndoCommand;
+import chess.controller.commands.PromoteCommand.PromoteType;
+import chess.controller.event.EmptyGameDispatcher;
+import chess.controller.event.GameAdaptator;
+import chess.model.ChessBoard;
+import chess.model.Color;
+import chess.model.Game;
+import chess.model.Move;
+import chess.model.PermissiveGame;
+
+public class GameSimulation extends GameAdaptator {
+
+	private final CommandExecutor simulation;
+	private final Game gameSimulation;
+
+	public GameSimulation() {
+		this.gameSimulation = new PermissiveGame();
+		this.simulation = new CommandExecutor(gameSimulation, new EmptyGameDispatcher());
+	}
+
+	protected CommandResult sendCommand(Command command) {
+		CommandResult result = this.simulation.executeCommand(command);
+		if (result == CommandResult.NotAllowed) {
+			System.out.println("eeeeee");
+		}
+		return result;
+	}
+
+	public void tryMove(Move move) {
+		sendCommand(new MoveCommand(move));
+		if (this.gameSimulation.getBoard().pawnShouldBePromoted())
+			sendCommand(new PromoteCommand(PromoteType.Queen));
+	}
+
+	public void undoMove() {
+		sendCommand(new UndoCommand());
+	}
+
+	@Override
+	public void onPawnPromoted(PromoteType promotion) {
+		sendCommand(new PromoteCommand(promotion));
+	}
+
+	@Override
+	public void onCastling(boolean bigCastling) {
+		sendCommand(new CastlingCommand(bigCastling));
+	}
+
+	@Override
+	public void onMove(Move move) {
+		sendCommand(new MoveCommand(move));
+	}
+
+	@Override
+	public void onGameStart() {
+		sendCommand(new NewGameCommand());
+	}
+
+	@Override
+	public void onPlayerTurn(Color color, boolean undone) {
+		if (undone)
+			sendCommand(new UndoCommand());
+	}
+
+	public CommandExecutor getCommandExecutor() {
+		return simulation;
+	}
+
+	public Game getGame() {
+		return gameSimulation;
+	}
+
+	public ChessBoard getBoard() {
+		return this.gameSimulation.getBoard();
+	}
+
+	public Color getPlayerTurn() {
+		return this.gameSimulation.getPlayerTurn();
+	}
+
+	public List<Move> getAllowedMoves() {
+		GetPlayerMovesCommand cmd = new GetPlayerMovesCommand();
+		sendCommand(cmd);
+		return cmd.getMoves();
+	}
+
+	public void close() {
+		this.simulation.close();
+	}
+
+}

app/src/main/java/chess/controller/CommandExecutor.java

@@ -2,6 +2,7 @@ package chess.controller;
 
 import chess.controller.Command.CommandResult;
 import chess.controller.commands.UndoCommand;
+import chess.controller.event.AsyncGameDispatcher;
 import chess.controller.event.GameDispatcher;
 import chess.controller.event.GameListener;
 import chess.model.Game;
@@ -17,9 +18,9 @@ public class CommandExecutor {
 	}
 
 	public CommandExecutor(Game game) {
-		this(game, new GameDispatcher());
+		this(game, new AsyncGameDispatcher());
 	}
-	
+
 	public CommandExecutor(Game game, GameDispatcher dispatcher) {
 		this.game = game;
 		this.dispatcher = dispatcher;
@@ -52,19 +53,21 @@ public class CommandExecutor {
 				return;
 
 			case Moved:
+				boolean notifyPlayerTurn = true;
 				this.dispatcher.onBoardUpdate();
-				if (checkGameStatus()) {
+				if (!(command instanceof UndoCommand) && checkGameStatus()) {
 					this.dispatcher.onGameEnd();
-					return;
+					notifyPlayerTurn = false;
 				}
-				switchPlayerTurn(command instanceof UndoCommand);
+				switchPlayerTurn(command instanceof UndoCommand, notifyPlayerTurn);
 				return;
 		}
 	}
 
-	private void switchPlayerTurn(boolean undone) {
+	private void switchPlayerTurn(boolean undone, boolean notifyPlayerTurn) {
 		this.game.switchPlayerTurn();
-		this.dispatcher.onPlayerTurn(this.game.getPlayerTurn(), undone);
+		if (notifyPlayerTurn)
+			this.dispatcher.onPlayerTurn(this.game.getPlayerTurn(), undone);
 	}
 
 	/**
@@ -107,6 +110,6 @@ public class CommandExecutor {
 	}
 
 	public void close() {
-		this.dispatcher.stopService();
+		this.dispatcher.close();
 	}
 }

app/src/main/java/chess/controller/commands/CastlingCommand.java

@@ -49,6 +49,10 @@ public class CastlingCommand extends PlayerCommand {
 		board.applyMove(this.kingMove);
 		board.applyMove(this.rookMove);
 
+		board.setLastMove(this.kingMove);
+
+		outputSystem.onCastling(this.bigCastling);
+
 		return CommandResult.Moved;
 	}
 

app/src/main/java/chess/controller/commands/MoveCommand.java

@@ -37,7 +37,6 @@ public class MoveCommand extends PlayerCommand {
 				return result;
 
 			case Moved:
-				outputSystem.onMove(this.move);
 				game.saveTraitPiecesPos();
 				return result;
 
@@ -53,7 +52,7 @@ public class MoveCommand extends PlayerCommand {
 		final ChessBoard board = game.getBoard();
 
 		// we must promote the pending pawn before
-		if (board.pawnShouldBePromoted())
+		if (game.pawnShouldBePromoted())
 			return CommandResult.NotAllowed;
 
 		Piece piece = board.pieceAt(move.getStart());
@@ -76,11 +75,14 @@ public class MoveCommand extends PlayerCommand {
 		}
 
 		if (tryPromote(game, outputSystem)) {
+			outputSystem.onMove(this.move);
 			return CommandResult.ActionNeeded;
 		}
 
 		board.setLastMove(this.move);
 
+		outputSystem.onMove(this.move);
+
 		return CommandResult.Moved;
 	}
 

app/src/main/java/chess/controller/commands/PromoteCommand.java

@@ -55,6 +55,8 @@ public class PromoteCommand extends PlayerCommand {
 		this.oldPawn = pawn;
 		board.pieceComes(createPiece(this.promoteType, pawn.getColor()), this.pieceCoords);
 
+		outputSystem.onPawnPromoted(this.promoteType);
+
 		return CommandResult.Moved;
 	}
 

app/src/main/java/chess/controller/event/AsyncGameDispatcher.java

@@ -0,0 +1,113 @@
+package chess.controller.event;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.function.Consumer;
+
+import chess.controller.commands.PromoteCommand.PromoteType;
+import chess.model.Color;
+import chess.model.Coordinate;
+import chess.model.Move;
+
+public class AsyncGameDispatcher extends GameDispatcher {
+
+	private final List<GameListener> listeners;
+	private final ExecutorService executor;
+
+	public AsyncGameDispatcher() {
+		this.listeners = new ArrayList<>();
+		this.executor = Executors.newSingleThreadExecutor();
+	}
+
+	@Override
+	public void addListener(GameListener listener) {
+		this.listeners.add(listener);
+	}
+
+	private void asyncForEachCall(Consumer<GameListener> func) {
+		this.executor.execute(() -> this.listeners.forEach(func));
+	}
+
+	@Override
+	public void onPlayerTurn(Color color, boolean undone) {
+		asyncForEachCall((l) -> l.onPlayerTurn(color, undone));
+	}
+
+	@Override
+	public void onWin(Color color) {
+		asyncForEachCall((l) -> l.onWin(color));
+	}
+
+	@Override
+	public void onKingInCheck() {
+		asyncForEachCall((l) -> l.onKingInCheck());
+	}
+
+	@Override
+	public void onKingInMat() {
+		asyncForEachCall((l) -> l.onKingInMat());
+	}
+
+	@Override
+	public void onPatSituation() {
+		asyncForEachCall((l) -> l.onPatSituation());
+	}
+
+	@Override
+	public void onSurrender(Color color) {
+		asyncForEachCall((l) -> l.onSurrender(color));
+	}
+
+	@Override
+	public void onGameStart() {
+		asyncForEachCall((l) -> l.onGameStart());
+	}
+
+	@Override
+	public void onPromotePawn(Coordinate pieceCoords) {
+		asyncForEachCall((l) -> l.onPromotePawn(pieceCoords));
+	}
+
+	@Override
+	public void onBoardUpdate() {
+		asyncForEachCall((l) -> l.onBoardUpdate());
+	}
+
+	@Override
+	public void onGameEnd() {
+		asyncForEachCall((l) -> l.onGameEnd());
+	}
+
+	@Override
+	public void onMove(Move move) {
+		asyncForEachCall((l) -> l.onMove(move));
+	}
+
+	@Override
+	public void onMoveNotAllowed(Move move) {
+		asyncForEachCall((l) -> l.onMoveNotAllowed(move));
+	}
+
+	@Override
+	public void onDraw() {
+		asyncForEachCall((l) -> l.onDraw());
+	}
+
+	@Override
+	public void onCastling(boolean bigCastling) {
+		asyncForEachCall((l) -> l.onCastling(bigCastling));		
+	}
+
+	@Override
+	public void onPawnPromoted(PromoteType promotion) {
+		asyncForEachCall((l) -> l.onPawnPromoted(promotion));
+	}
+
+	@Override
+	public void close() {
+		this.executor.shutdown();
+	}
+
+}

app/src/main/java/chess/controller/event/EmptyGameDispatcher.java

@@ -1,5 +1,6 @@
 package chess.controller.event;
 
+import chess.controller.commands.PromoteCommand.PromoteType;
 import chess.model.Color;
 import chess.model.Coordinate;
 import chess.model.Move;
@@ -57,5 +58,21 @@ public class EmptyGameDispatcher extends GameDispatcher {
 	@Override
 	public void onWin(Color winner) {
 	}
-	
+
+	@Override
+	public void onCastling(boolean bigCastling) {
+	}
+
+	@Override
+	public void onPawnPromoted(PromoteType promotion) {
+	}
+
+	@Override
+	public void addListener(GameListener listener) {
+	}
+
+	@Override
+	public void close() {
+	}
+
 }

app/src/main/java/chess/controller/event/GameAdaptator.java

@@ -1,5 +1,6 @@
 package chess.controller.event;
 
+import chess.controller.commands.PromoteCommand.PromoteType;
 import chess.model.Color;
 import chess.model.Coordinate;
 import chess.model.Move;
@@ -45,4 +46,10 @@ public abstract class GameAdaptator implements GameListener {
 	@Override
 	public void onDraw() {}
 
+	@Override
+	public void onCastling(boolean bigCastling) {}
+
+	@Override
+	public void onPawnPromoted(PromoteType promotion) {}
+
 }

app/src/main/java/chess/controller/event/GameDispatcher.java

@@ -1,100 +1,9 @@
 package chess.controller.event;
 
-import java.util.ArrayList;
-import java.util.List;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Executors;
-import java.util.function.Consumer;
+public abstract class GameDispatcher extends GameAdaptator {
 
-import chess.model.Color;
-import chess.model.Coordinate;
-import chess.model.Move;
-
-public class GameDispatcher implements GameListener {
-
-	private final List<GameListener> listeners;
-	private final ExecutorService executor;
-
-	public GameDispatcher() {
-		this.listeners = new ArrayList<>();
-		this.executor = Executors.newSingleThreadExecutor();
-	}
-
-	public void addListener(GameListener listener) {
-		this.listeners.add(listener);
-	}
-
-	private void asyncForEachCall(Consumer<GameListener> func) {
-		this.executor.execute(() -> this.listeners.forEach(func));
-	}
-
-	@Override
-	public void onPlayerTurn(Color color, boolean undone) {
-		asyncForEachCall((l) -> l.onPlayerTurn(color, undone));
-	}
-
-	@Override
-	public void onWin(Color color) {
-		asyncForEachCall((l) -> l.onWin(color));
-	}
-
-	@Override
-	public void onKingInCheck() {
-		asyncForEachCall((l) -> l.onKingInCheck());
-	}
-
-	@Override
-	public void onKingInMat() {
-		asyncForEachCall((l) -> l.onKingInMat());
-	}
-
-	@Override
-	public void onPatSituation() {
-		asyncForEachCall((l) -> l.onPatSituation());
-	}
-
-	@Override
-	public void onSurrender(Color color) {
-		asyncForEachCall((l) -> l.onSurrender(color));
-	}
-
-	@Override
-	public void onGameStart() {
-		asyncForEachCall((l) -> l.onGameStart());
-	}
-
-	@Override
-	public void onPromotePawn(Coordinate pieceCoords) {
-		asyncForEachCall((l) -> l.onPromotePawn(pieceCoords));
-	}
-
-	@Override
-	public void onBoardUpdate() {
-		asyncForEachCall((l) -> l.onBoardUpdate());
-	}
-
-	@Override
-	public void onGameEnd() {
-		asyncForEachCall((l) -> l.onGameEnd());
-	}
-
-	@Override
-	public void onMove(Move move) {
-		asyncForEachCall((l) -> l.onMove(move));
-	}
-
-	@Override
-	public void onMoveNotAllowed(Move move) {
-		asyncForEachCall((l) -> l.onMoveNotAllowed(move));
-	}
-
-	@Override
-	public void onDraw() {
-		asyncForEachCall((l) -> l.onDraw());
-	}
-
-	public void stopService() {
-		this.executor.shutdown();
-	}
+	public abstract void addListener(GameListener listener);
 
+	public abstract void close();
+	
 }

app/src/main/java/chess/controller/event/GameListener.java

@@ -1,5 +1,6 @@
 package chess.controller.event;
 
+import chess.controller.commands.PromoteCommand.PromoteType;
 import chess.model.Color;
 import chess.model.Coordinate;
 import chess.model.Move;
@@ -15,7 +16,7 @@ public interface GameListener {
 	 * Invoked when a draw occurs (same position is repeated three times)
 	 */
 	void onDraw();
-	
+
 	/**
 	 * Invoked when the game has ended (by a win or a draw)
 	 */
@@ -25,7 +26,7 @@ public interface GameListener {
 	 * Invoked when the game has started
 	 */
 	void onGameStart();
-	
+
 	/**
 	 * Invoked when a king is in check
 	 */
@@ -35,47 +36,68 @@ public interface GameListener {
 	 * Invoked when a checkmate occurs
 	 */
 	void onKingInMat();
-	
+
 	/**
 	 * Invoked when a valid move on the board occurs
+	 * 
 	 * @param move the move to be processed
 	 */
 	void onMove(Move move);
 
 	/**
 	 * Invoked when a sent move is not allowed
+	 * 
 	 * @param move the move to be processed
 	 */
 	void onMoveNotAllowed(Move move);
-	
+
 	/**
 	 * Invoked when a pat situation occurs
 	 */
 	void onPatSituation();
-	
+
 	/**
 	 * Invoked when it's the player turn
-	 * @param color the color of the player who should play
+	 * 
+	 * @param color  the color of the player who should play
 	 * @param undone true if it's a result of an undo command
 	 */
 	void onPlayerTurn(Color color, boolean undone);
-	
+
 	/**
 	 * Invoked when a pawn should be promoted
+	 * 
 	 * @param pieceCoords the coordinates of the pawn
 	 */
 	void onPromotePawn(Coordinate pieceCoords);
-	
+
 	/**
 	 * Invoked when a players surrenders
+	 * 
 	 * @param coward the player who gave up
 	 */
 	void onSurrender(Color coward);
-	
+
 	/**
 	 * Invoked when a player wins (by checkmate or if the other one surrenders)
+	 * 
 	 * @param winner
 	 */
 	void onWin(Color winner);
 
+	/**
+	 * Invoked when a castling is done
+	 * 
+	 * @param bigCastling if it's queen side castling
+	 */
+	void onCastling(boolean bigCastling);
+
+	/**
+	 * Invoked when a pawn is promoted
+	 * 
+	 * @param promotion the type of promotion
+	 * @param player the player who promoted the pawns
+	 */
+	void onPawnPromoted(PromoteType promotion);
+
 }

app/src/main/java/chess/model/ChessBoard.java

@@ -4,7 +4,7 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Objects;
 
-import chess.model.visitor.KingIdentifier;
+import chess.model.pieces.King;
 import chess.model.visitor.PawnIdentifier;
 import chess.model.visitor.PiecePathChecker;
 
@@ -31,6 +31,10 @@ public class ChessBoard {
 	private Move lastMove;
 	private Piece lastEjectedPiece;
 
+	private List<Move> cachedAllowedMoves = null;
+
+	private final Coordinate kingPos[];
+
 	public ChessBoard() {
 		this.cells = new Cell[Coordinate.VALUE_MAX][Coordinate.VALUE_MAX];
 		for (int i = 0; i < Coordinate.VALUE_MAX; i++) {
@@ -41,6 +45,7 @@ public class ChessBoard {
 		this.lastVirtualMove = null;
 		this.lastMove = null;
 		this.lastEjectedPiece = null;
+		this.kingPos = new Coordinate[Color.values().length];
 	}
 
 	public void applyMove(Move move) {
@@ -98,6 +103,8 @@ public class ChessBoard {
 
 	public void pieceComes(Piece piece, Coordinate coordinate) {
 		cellAt(coordinate).setPiece(piece);
+		if (piece instanceof King)
+			this.kingPos[piece.getColor().ordinal()] = coordinate;
 	}
 
 	public void pieceLeaves(Coordinate coordinate) {
@@ -105,18 +112,19 @@ public class ChessBoard {
 	}
 
 	public Coordinate findKing(Color color) {
-		KingIdentifier kingIdentifier = new KingIdentifier(color);
-		for (int i = 0; i < Coordinate.VALUE_MAX; i++) {
-			for (int j = 0; j < Coordinate.VALUE_MAX; j++) {
-				Coordinate coordinate = new Coordinate(i, j);
-				Piece piece = pieceAt(coordinate);
-				if (kingIdentifier.isKing(piece)) {
-					return coordinate;
-				}
-			}
-		}
-		assert false : "No king found ?!";
-		return null;
+		// KingIdentifier kingIdentifier = new KingIdentifier(color);
+		// for (int i = 0; i < Coordinate.VALUE_MAX; i++) {
+		// 	for (int j = 0; j < Coordinate.VALUE_MAX; j++) {
+		// 		Coordinate coordinate = new Coordinate(i, j);
+		// 		Piece piece = pieceAt(coordinate);
+		// 		if (kingIdentifier.isKing(piece)) {
+		// 			return coordinate;
+		// 		}
+		// 	}
+		// }
+		// assert false : "No king found ?!";
+		// return null;
+		return kingPos[color.ordinal()];
 	}
 
 	public boolean isKingInCheck(Color color) {
@@ -127,7 +135,7 @@ public class ChessBoard {
 			for (int j = 0; j < Coordinate.VALUE_MAX; j++) {
 				Coordinate attackCoords = new Coordinate(i, j);
 				Piece attackPiece = pieceAt(attackCoords);
-				if (attackPiece == null)
+				if (attackPiece == null || attackPiece.getColor() == color)
 					continue;
 
 				PiecePathChecker checker = new PiecePathChecker(this, new Move(attackCoords, kingPos));
@@ -143,6 +151,10 @@ public class ChessBoard {
 	}
 
 	public List<Move> getAllowedMoves(Color player) {
+		if (this.cachedAllowedMoves != null) {
+			return this.cachedAllowedMoves;
+		}
+
 		List<Move> result = new ArrayList<>();
 
 		for (int x = 0; x < Coordinate.VALUE_MAX; x++) {
@@ -159,6 +171,11 @@ public class ChessBoard {
 						Coordinate destination = new Coordinate(i, j);
 						Move move = new Move(start, destination);
 
+						Piece destPiece = pieceAt(destination);
+
+						if (destPiece != null && destPiece.getColor() == player)
+							continue;
+
 						PiecePathChecker piecePathChecker = new PiecePathChecker(this,
 								move);
 						if (!piecePathChecker.isValid())
@@ -172,6 +189,7 @@ public class ChessBoard {
 				}
 			}
 		}
+		this.cachedAllowedMoves = result;
 		return result;
 	}
 
@@ -300,10 +318,11 @@ public class ChessBoard {
 
 	public void setLastMove(Move lastMove) {
 		this.lastMove = lastMove;
+		this.cachedAllowedMoves = null;
 	}
 
 	@Override
-	public boolean equals(Object obj){
+	public boolean equals(Object obj) {
 		if (obj instanceof ChessBoard board)
 			return board.hashCode() == this.hashCode();
 		return false;

app/src/main/java/chess/model/Game.java

@@ -70,24 +70,27 @@ public class Game {
 		playerTurn = Color.getEnemy(playerTurn);
 	}
 
-	public GameStatus checkGameStatus() {
-		final Color enemy = Color.getEnemy(getPlayerTurn());
-
+	// this is the bottleneck of algorithms using this chess engine
+	public GameStatus checkGameStatus(Color color) {
 		if (checkDraw())
 			return GameStatus.Draw;
 
-		if (this.board.isKingInCheck(enemy))
-			if (this.board.hasAllowedMoves(enemy))
+		if (this.board.isKingInCheck(color))
+			if (this.board.hasAllowedMoves(color))
 				return GameStatus.Check;
 			else
 				return GameStatus.CheckMate;
 
-		if (!board.hasAllowedMoves(enemy))
+		if (!board.hasAllowedMoves(color))
 			return GameStatus.Pat;
 
 		return GameStatus.OnGoing;
 	}
 
+	public GameStatus checkGameStatus() {
+		return checkGameStatus(Color.getEnemy(getPlayerTurn()));
+	}
+
 	public void addAction(PlayerCommand command) {
 		this.movesHistory.add(command);
 	}
@@ -119,4 +122,8 @@ public class Game {
 		return this.movesHistory;
 	}
 
+	public boolean pawnShouldBePromoted() {
+		return this.board.pawnShouldBePromoted();
+	}
+
 }

app/src/main/java/chess/model/PermissiveGame.java

@@ -0,0 +1,20 @@
+package chess.model;
+
+public class PermissiveGame extends Game {
+
+	@Override
+	public GameStatus checkGameStatus(Color color) {
+		return GameStatus.OnGoing;
+	}
+
+	@Override
+	public void undoTraitPiecesPos() {
+		
+	}
+
+	@Override
+	public void saveTraitPiecesPos() {
+		
+	}
+
+}

app/src/main/java/chess/pgn/PgnExport.java

@@ -21,24 +21,24 @@ import chess.model.pieces.Pawn;
 public class PgnExport {
 
 	// public static void main(String[] args) {
-	// 	final Game game = new Game();
-	// 	final CommandExecutor commandExecutor = new CommandExecutor(game);
+	// final Game game = new Game();
+	// final CommandExecutor commandExecutor = new CommandExecutor(game);
 
-	// 	DumbAI ai1 = new DumbAI(commandExecutor, Color.White);
-	// 	commandExecutor.addListener(ai1);
+	// DumbAI ai1 = new DumbAI(commandExecutor, Color.White);
+	// commandExecutor.addListener(ai1);
 
-	// 	DumbAI ai2 = new DumbAI(commandExecutor, Color.Black);
-	// 	commandExecutor.addListener(ai2);
+	// DumbAI ai2 = new DumbAI(commandExecutor, Color.Black);
+	// commandExecutor.addListener(ai2);
 
-	// 	commandExecutor.addListener(new GameAdaptator() {
-	// 		@Override
-	// 		public void onGameEnd() {
-	// 			System.out.println(exportGame(game));
-	// 			commandExecutor.close();
-	// 		}
-	// 	});
+	// commandExecutor.addListener(new GameAdaptator() {
+	// @Override
+	// public void onGameEnd() {
+	// System.out.println(exportGame(game));
+	// commandExecutor.close();
+	// }
+	// });
 
-	// 	commandExecutor.executeCommand(new NewGameCommand());
+	// commandExecutor.executeCommand(new NewGameCommand());
 	// }
 
 	private static final PiecePgnName piecePgnName = new PiecePgnName();
@@ -56,15 +56,15 @@ public class PgnExport {
 	}
 
 	private static String gameEnd(Game game) {
-		switch (game.checkGameStatus()) {
+		switch (game.checkGameStatus(game.getPlayerTurn())) {
 			case Draw:
 			case Pat:
 				return "1/2-1/2";
 
 			case CheckMate:
 				if (game.getPlayerTurn() == Color.White)
-					return "1-0";
-				return "0-1";
+					return "0-1";
+				return "1-0";
 
 			default:
 				return "";
@@ -137,7 +137,7 @@ public class PgnExport {
 	}
 
 	private static String checkCheckMate(Game game) {
-		switch (game.checkGameStatus()) {
+		switch (game.checkGameStatus(game.getPlayerTurn())) {
 			case CheckMate:
 				return "#";
 

app/src/main/java/chess/view/consolerender/Console.java

@@ -333,4 +333,11 @@ public class Console implements GameListener {
         this.captureInput = captureInput;
     }
 
+    @Override
+    public void onCastling(boolean bigCastling) {}
+
+    @Override
+    public void onPawnPromoted(PromoteType promotion) {}
+    
+
 }

app/src/main/java/chess/view/simplerender/Window.java

@@ -318,4 +318,10 @@ public class Window extends JFrame implements GameListener {
 		JOptionPane.showMessageDialog(this, "Same position was repeated three times. It's a draw!");
 	}
 
+	@Override
+	public void onCastling(boolean bigCastling) {}
+
+	@Override
+	public void onPawnPromoted(PromoteType promotion) {}
+
 }

app/src/main/resources/games/wendy.pgn

@@ -0,0 +1,12 @@
+1. e4 {1.e4 $1 A fiery start $1} 1... e5 {I like how this game is starting $1} 2. Nc3
+Bc5 {J'aime un feu chaud.} 3. Nf3 {It's too cold in here for my liking.} 3...
+Qf6 4. Nd5 Qd6 5. d3 c6 {A fiery position is what I seek $1} 6. Nc3 h6 7. a3 Qg6
+8. Nxe5 {Things are beginning to heat up, non $2} 8... Qd6 9. Nc4 Qe6 10. d4 Be7
+11. Ne3 b5 12. Nf5 d5 13. Nxg7+ {That's not very nice.} 13... Kd7 14. Nxe6
+{Brrrrrr. It is getting cold in here.} 14... fxe6 15. exd5 cxd5 16. Bf4 Nf6 17.
+Bxb5+ Kd8 18. Qf3 Bd7 19. Be5 {My attack is getting cold, I need to go get some
+more firewood $1} 19... a6 20. Bxf6 Re8 21. Bxe7+ Kxe7 22. Nxd5+ exd5 23. Qxd5
+Kf8+ {It's getting toasty in here $1} 24. Be2 Bc6 25. Qd6+ Re7 26. Kf1 Ba4 27. b3
+Nc6 28. bxa4 a5 29. Qxc6 Rd8 30. Qxh6+ Kg8 31. Bc4+ Rf7 32. Qg5+ Kh8 33. Bxf7
+{C'est très, très mauvais $1} 33... Kh7 34. Qg6+ Kh8 35. Ra2 Rxd4 36. Qg8# {Good
+play $1 I'll have to throw another log on the fire and try again.} 1-0