en passant rule

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

@@ -3,5 +3,12 @@ package chess.controller;
 import chess.model.Game;
 
 public abstract class PlayerCommand extends Command{
-	public abstract CommandResult undo(Game game, OutputSystem outputSystem);
+
+	public CommandResult undo(Game game, OutputSystem outputSystem) {
+		CommandResult result = undoImpl(game, outputSystem);
+		game.updateLastMove();
+		return result;
+	}
+
+	protected abstract CommandResult undoImpl(Game game, OutputSystem outputSystem);
 }

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

@@ -16,7 +16,7 @@ public class CastlingCommand extends PlayerCommand {
 	}
 
 	@Override
-	public CommandResult undo(Game game, OutputSystem outputSystem) {
+	protected CommandResult undoImpl(Game game, OutputSystem outputSystem) {
 		// TODO Auto-generated method stub
 		throw new UnsupportedOperationException("Unimplemented method 'undo'");
 	}

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

@@ -16,7 +16,7 @@ public class GrandCastlingCommand extends PlayerCommand {
 	}
 
 	@Override
-	public CommandResult undo(Game game, OutputSystem outputSystem) {
+	protected CommandResult undoImpl(Game game, OutputSystem outputSystem) {
 		// TODO Auto-generated method stub
 		throw new UnsupportedOperationException("Unimplemented method 'undo'");
 	}

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

@@ -10,7 +10,7 @@ import chess.model.Piece;
 import chess.model.visitor.PiecePathChecker;
 
 public class MoveCommand extends PlayerCommand {
-	
+
 	private final Move move;
 	private Piece deadPiece;
 
@@ -42,7 +42,7 @@ public class MoveCommand extends PlayerCommand {
 		if (!valid)
 			return CommandResult.NotAllowed;
 
-		this.deadPiece = board.pieceAt(move.getFinish());
+		this.deadPiece = board.pieceAt(move.getDeadPieceCoords());
 		board.applyMove(move);
 
 		if (board.isKingInCheck(game.getPlayerTurn())) {
@@ -50,14 +50,15 @@ public class MoveCommand extends PlayerCommand {
 			return CommandResult.NotAllowed;
 		}
 
-		if (game.pawnShouldBePromoted()) 
+		if (game.pawnShouldBePromoted())
 			return CommandResult.ActionNeeded;
 
+		board.setLastMove(this.move);
 		return CommandResult.Moved;
 	}
 
 	@Override
-	public CommandResult undo(Game game, OutputSystem outputSystem) {
+	protected CommandResult undoImpl(Game game, OutputSystem outputSystem) {
 		final ChessBoard board = game.getBoard();
 
 		board.undoMove(move, deadPiece);

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

@@ -75,7 +75,7 @@ public class PromoteCommand extends PlayerCommand {
 	}
 
 	@Override
-	public CommandResult undo(Game game, OutputSystem outputSystem) {
+	protected CommandResult undoImpl(Game game, OutputSystem outputSystem) {
 		final ChessBoard board = game.getBoard();
 
 		Piece promoted = board.pieceAt(this.pieceCoords);