en passant rule

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

@@ -25,6 +25,7 @@ public class ChessBoard {
 	}
 
 	private final Cell[][] cells;
+	private Move lastVirtualMove;
 	private Move lastMove;
 	private Piece lastEjectedPiece;
 
@@ -35,35 +36,38 @@ public class ChessBoard {
 				this.cells[i][j] = new Cell();
 			}
 		}
+		this.lastVirtualMove = null;
 		this.lastMove = null;
 		this.lastEjectedPiece = null;
 	}
 
 	public void applyMove(Move move) {
 		assert move.isValid() : "Invalid move !";
-		Piece deadPiece = pieceAt(move.getFinish());
+		Piece deadPiece = pieceAt(move.getDeadPieceCoords());
 		if (deadPiece != null) {
 			this.lastEjectedPiece = deadPiece;
 		} else {
 			this.lastEjectedPiece = null;
 		}
 		Piece movingPiece = pieceAt(move.getStart());
-		pieceComes(movingPiece, move.getFinish());
+		pieceLeaves(move.getDeadPieceCoords());
 		pieceLeaves(move.getStart());
+		pieceComes(movingPiece, move.getFinish());
 		movingPiece.move();
-		this.lastMove = move;
+		this.lastVirtualMove = move;
 	}
 
 	public void undoLastMove() {
-		assert this.lastMove != null: "Can't undo at the beginning!";
+		assert this.lastVirtualMove != null: "Can't undo at the beginning!";
 
-		undoMove(this.lastMove, this.lastEjectedPiece);
+		undoMove(this.lastVirtualMove, this.lastEjectedPiece);
 	}
 
 	public void undoMove(Move move, Piece deadPiece) {
 		Piece movingPiece = pieceAt(move.getFinish());
 		pieceComes(movingPiece, move.getStart());
-		pieceComes(deadPiece, move.getFinish());
+		pieceLeaves(move.getFinish());
+		pieceComes(deadPiece, move.getDeadPieceCoords());
 		movingPiece.unMove();
 	}
 
@@ -177,4 +181,12 @@ public class ChessBoard {
 		return result;
 	}
 
+	public Move getLastMove() {
+		return this.lastMove;
+	}
+
+	public void setLastMove(Move lastMove) {
+		this.lastMove = lastMove;
+	}
+
 }