Fix for double boards when the player starts the game by clicking 'play' instead of pressing <Enter>.

src/view/UserChooserFrame.java

@@ -31,8 +31,10 @@ public class UserChooserFrame extends JFrame {
 	private final Player comPlayer;
 	private final JButton playButton = new JButton("Play!");
 	private final JComboBox<String> userNameBox = new JComboBox<String>();
+	
 	private ArrayList<String> users;
-
+	private boolean gameLaunched = false;
+	
 	public UserChooserFrame(ParsedArgs parsedArgs) {
 		this.comPlayer = parsedArgs.getComPlayer();
 		initLayout();
@@ -143,6 +145,10 @@ public class UserChooserFrame extends JFrame {
 	}
 
 	void launchSelectedPlayer() {
+		if (gameLaunched) {
+			return;
+		}
+		
 		String name = ((String) userNameBox.getSelectedItem());
 		name = name == null ? name : name.trim().toLowerCase();
 
@@ -162,6 +168,7 @@ public class UserChooserFrame extends JFrame {
 
 			saveUserList();
 			new MainFrame(name, comPlayer);
+			gameLaunched = true;
 		}
 	}
 }