diff --git a/src/dev/kske/chess/game/Game.java b/src/dev/kske/chess/game/Game.java
index cbe4ba8..09ba1dd 100644
--- a/src/dev/kske/chess/game/Game.java
+++ b/src/dev/kske/chess/game/Game.java
@@ -29,10 +29,6 @@ public class Game {
 		players.values().forEach(player -> player.setGame(this));
 	}
 
-	public void start() {
-		players.get(Color.WHITE).requestMove();
-	}
-
 	public void onMove(Player player, Move move) {
 		if (board.getPos(move).getColor() == player.color && board.attemptMove(move)) {
 			System.out.printf("%s: %s%n", player.color, move);
@@ -51,4 +47,15 @@ public class Game {
 			}
 		} else player.requestMove();
 	}
+
+	public void start() {
+		players.get(Color.WHITE).requestMove();
+	}
+
+	public void restart() {
+		players.forEach((k, v) -> v.cancelMove());
+		board.initializeDefaultPositions();
+		boardComponent.repaint();
+		start();
+	}
 }
diff --git a/src/dev/kske/chess/game/NaturalPlayer.java b/src/dev/kske/chess/game/NaturalPlayer.java
index d346a71..2c97782 100644
--- a/src/dev/kske/chess/game/NaturalPlayer.java
+++ b/src/dev/kske/chess/game/NaturalPlayer.java
@@ -61,4 +61,9 @@ public class NaturalPlayer extends Player {
 	public void requestMove() {
 		moveRequested = true;
 	}
+
+	@Override
+	public void cancelMove() {
+		moveRequested = false;
+	}
 }
diff --git a/src/dev/kske/chess/game/Player.java b/src/dev/kske/chess/game/Player.java
index fd34dde..a67d7ac 100644
--- a/src/dev/kske/chess/game/Player.java
+++ b/src/dev/kske/chess/game/Player.java
@@ -22,6 +22,8 @@ public abstract class Player {
 
 	public abstract void requestMove();
 
+	public abstract void cancelMove();
+
 	public Game getGame() { return game; }
 
 	public void setGame(Game game) { this.game = game; }
diff --git a/src/dev/kske/chess/game/ai/AIPlayer.java b/src/dev/kske/chess/game/ai/AIPlayer.java
index 21a1155..003afd8 100644
--- a/src/dev/kske/chess/game/ai/AIPlayer.java
+++ b/src/dev/kske/chess/game/ai/AIPlayer.java
@@ -6,6 +6,7 @@ import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
 
 import javax.swing.SwingUtilities;
 
@@ -25,14 +26,19 @@ public class AIPlayer extends Player {
 	private int	availableProcessors;
 	private int	maxDepth;
 
+	private volatile boolean exitRequested;
+	private volatile ExecutorService	executor;
+
 	public AIPlayer(Board board, Color color, int maxDepth) {
 		super(board, color);
 		availableProcessors	= Runtime.getRuntime().availableProcessors();
 		this.maxDepth		= maxDepth;
+		exitRequested		= false;
 	}
 
 	@Override
 	public void requestMove() {
+		exitRequested = false;
 		/*
 		 * Define some processing threads, split the available moves between them and
 		 * retrieve the result after their execution.
@@ -41,8 +47,8 @@ public class AIPlayer extends Player {
 			/*
 			 * Get a copy of the board and the available moves.
 			 */
-			Board				board		= (Board) AIPlayer.this.board.clone();
-			List<Move>			moves		= board.getMoves(color);
+			Board		board	= (Board) AIPlayer.this.board.clone();
+			List<Move>	moves	= board.getMoves(color);
 
 			/*
 			 * Define move processors and split the available moves between them.
@@ -63,7 +69,7 @@ public class AIPlayer extends Player {
 			/*
 			 * Execute processors, get the best result and pass it back to the Game class
 			 */
-			ExecutorService			executor	= Executors.newFixedThreadPool(numThreads);
+			executor = Executors.newFixedThreadPool(numThreads);
 			List<ProcessingResult>	results		= new ArrayList<>(numThreads);
 			try {
 				List<Future<ProcessingResult>> futures = executor.invokeAll(processors);
@@ -74,7 +80,18 @@ public class AIPlayer extends Player {
 				ex.printStackTrace();
 			}
 			results.sort((r1, r2) -> Integer.compare(r2.score, r1.score));
-			SwingUtilities.invokeLater(() -> game.onMove(this, results.get(0).move));
+			if (!exitRequested) SwingUtilities.invokeLater(() -> game.onMove(this, results.get(0).move));
 		}, "AIPlayer calculation setup").start();
 	}
+
+	@Override
+	public void cancelMove() {
+		exitRequested = true;
+		executor.shutdownNow();
+		try {
+			executor.awaitTermination(500, TimeUnit.MILLISECONDS);
+		} catch (InterruptedException e) {
+			e.printStackTrace();
+		}
+	}
 }
diff --git a/src/dev/kske/chess/ui/GameModeDialog.java b/src/dev/kske/chess/ui/GameModeDialog.java
index 9c37a80..d7e04c5 100644
--- a/src/dev/kske/chess/ui/GameModeDialog.java
+++ b/src/dev/kske/chess/ui/GameModeDialog.java
@@ -26,10 +26,16 @@ public class GameModeDialog extends JDialog {
 
 	private static final long serialVersionUID = 5470026233924735607L;
 
+	private final MainWindow			parent;
+	private final Board					board;
+	private final OverlayComponent		overlayComponent;
+	private final BoardComponent		boardComponent;
+	private final Map<Color, Player>	players;
+
 	/**
 	 * Create the dialog.
 	 */
-	public GameModeDialog(BoardPane boardPane) {
+	public GameModeDialog(MainWindow parent, BoardPane boardPane) {
 		super();
 		setModal(true);
 		setTitle("Game Mode Selection");
@@ -46,40 +52,43 @@ public class GameModeDialog extends JDialog {
 			}
 		});
 
-		final BoardComponent	boardComponent		= boardPane.getBoardComponent();
-		final OverlayComponent	overlayComponent	= boardPane.getOverlayComponent();
-		final Board				board				= boardComponent.getBoard();
+		this.parent			= parent;
+		boardComponent		= boardPane.getBoardComponent();
+		overlayComponent	= boardPane.getOverlayComponent();
+		board				= boardComponent.getBoard();
+		players				= new HashMap<>();
 
 		JButton btnNatural = new JButton("Game against natural opponent");
 		btnNatural.addActionListener((evt) -> {
-			Map<Color, Player> players = new HashMap<>();
 			players.put(Color.WHITE, new NaturalPlayer(board, Color.WHITE, overlayComponent));
 			players.put(Color.BLACK, new NaturalPlayer(board, Color.BLACK, overlayComponent));
-			new Game(players, boardComponent).start();
-			dispose();
+			startGame();
 		});
 		getContentPane().add(btnNatural);
 
 		JButton btnAI = new JButton("Game against AI");
 		btnAI.addActionListener((evt) -> {
-			Map<Color, Player> players = new HashMap<>();
 			players.put(Color.WHITE, new NaturalPlayer(board, Color.WHITE, overlayComponent));
 			players.put(Color.BLACK, new AIPlayer(board, Color.BLACK, 5));
-			new Game(players, boardComponent).start();
-			dispose();
+			startGame();
 		});
 		getContentPane().add(btnAI);
 
 		JButton btnAI2 = new JButton("AI against AI");
 		btnAI2.addActionListener((evt) -> {
-			Map<Color, Player> players = new HashMap<>();
 			players.put(Color.WHITE, new AIPlayer(board, Color.WHITE, 5));
 			players.put(Color.BLACK, new AIPlayer(board, Color.BLACK, 4));
-			new Game(players, boardComponent).start();
-			dispose();
+			startGame();
 		});
 		getContentPane().add(btnAI2);
 
 		setLocationRelativeTo(null);
 	}
+
+	private void startGame() {
+		Game game = new Game(players, boardComponent);
+		parent.setGame(game);
+		game.start();
+		dispose();
+	}
 }
diff --git a/src/dev/kske/chess/ui/MainWindow.java b/src/dev/kske/chess/ui/MainWindow.java
index f6c2630..2c9c7fd 100644
--- a/src/dev/kske/chess/ui/MainWindow.java
+++ b/src/dev/kske/chess/ui/MainWindow.java
@@ -8,7 +8,7 @@ import javax.swing.JFrame;
 import javax.swing.JPanel;
 
 import dev.kske.chess.board.Board;
-
+import dev.kske.chess.game.Game;
 
 /**
  * Project: <strong>Chess</strong><br>
@@ -18,7 +18,8 @@ import dev.kske.chess.board.Board;
  */
 public class MainWindow {
 
-	private JFrame mframe;
+	private JFrame	mframe;
+	private Game	game;
 
 	/**
 	 * Launch the application.
@@ -61,12 +62,16 @@ public class MainWindow {
 		mframe.getContentPane().add(toolPanel, BorderLayout.NORTH);
 
 		JButton btnRestart = new JButton("Restart");
-		btnRestart.addActionListener((evt) -> System.err.println("Resetting not implemented!"));
+		btnRestart.addActionListener((evt) -> { if (game != null) game.restart(); });
 		toolPanel.add(btnRestart);
 		mframe.pack();
 		mframe.setLocationRelativeTo(null);
 
 		// Display dialog for game mode selection
-		new GameModeDialog(boardPane).setVisible(true);
+		new GameModeDialog(this, boardPane).setVisible(true);
 	}
+
+	public Game getGame() { return game; }
+
+	public void setGame(Game game) { this.game = game; }
 }