Undo/Redo a Move
You can undo any number of moves during
the game. To undo a move, press the Z key or select Undo from the menu on the right.
When you undo a move, computer shows the latest move that was made
before the moves that were undone. Please note that when you undo a
move, both the computer's latest move and your latest move are undone.
You can redo any move you have undone. To redo a move, press the Y key
or select Redo from the menu
on the right. When you redo a move, both your and the computer's moves
are redone.