Chess

Move legal pieces, answer checks, promote pawns when the file opens, and play a quick local board against the bot.

• Select a white piece, then choose a highlighted legal square.
• The local chess.js engine validates checks, checkmate, stalemate, castling, en passant, promotion, and draw states.
• Use H for a hint, U to undo the last exchange, and N for a new board.
• Wins, bot wins, and draws save on this device for quick rematches.