Tap a piece to select it; legal destinations appear as dots. Tap a destination to move.
- Standard rules: castling, en passant, and pawn promotion all work.
- When a pawn reaches the back rank, choose a piece to promote to.
- The king is highlighted in red when in check.
- Game ends on checkmate, stalemate, or insufficient material.
- In Vs. computer mode, Undo rewinds your move and the computer's reply together.