castling

Board.java

@@ -48,6 +48,17 @@ public class Board {
     }
   }
 
+  public void castle(King king, boolean kingSide) {
+    int row = king.pos.y;
+    if (kingSide) {
+      move(king, new Position(6, row));
+      move(board[7][row], new Position(5, row));
+    } else {
+      move(king, new Position(2, row));
+      move(board[0][row], new Position(3, row));
+    }
+  }
+
   public void draw(Graphics g) {
     for (Piece[] row : board) {
       for (Piece p : row) {