player command

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

@@ -1,15 +1,15 @@
 package chess.io.commands;
 
-import chess.io.Command;
 import chess.io.CommandResult;
 import chess.io.OutputSystem;
+import chess.io.PlayerCommand;
 import chess.model.ChessBoard;
 import chess.model.Game;
 import chess.model.Move;
 import chess.model.Piece;
 import chess.model.visitor.PiecePathChecker;
 
-public class MoveCommand extends Command {
+public class MoveCommand extends PlayerCommand {
 	private final Move move;
 
 	public MoveCommand(Move move) {
@@ -49,4 +49,9 @@ public class MoveCommand extends Command {
 		return CommandResult.Moved;
 	}
 
+	@Override
+	public void undo(Game game, OutputSystem outputSystem) {
+		game.getBoard().undoLastMove();
+	}
+
 }