Cellufun Chess - Play the immortal game of chess against others online, or practice against your phone or our powerful server AI with a variety of difficulty levels. Our fully featured chess supports legal move verification including En Passant, castling, stalemate and draw by repetition, and clock based play. Play against others is rated using the ELO rating system. Let us quickly match you with an appropriate player, or invite your friends to play. In-game chat, move undo, play-by-mail, and detailed game analysis makes Chess by Cellufun an appealing game to both beginners and masters alike.