UnCheck Chess

Get YOUR king attacked to WIN. UnCheck Chess turns the goal of chess around. Play this original variant against Jester, or enjoy Classic Chess against Sage. Both neural bots run entirely on your iPhone, even offline. UNCHECK CHESS AGAINST JESTER Move your king into danger. If YOUR turn begins with YOUR king attacked by an opposing piece, you immediately WIN. Your opponent has one move to remove every attack on your king before your turn comes back. Use sacrifices, blockers and compulsory captures to leave them no escape. • Captures are compulsory whenever a permitted capture exists. • Kings may move into attack and are never captured. • You choose which capture to make when several are available. • In UnCheck only, castling may cross attacked squares; having no permitted move is a draw, and ordinary insufficient-material draws do not apply. CLASSIC CHESS AGAINST SAGE Keep YOUR king safe. Checkmate THEIR king to WIN. Standard chess movement, king safety and checkmate rules apply. SEE HOW THE BOTS THINK Watch the model's board input, explore its policy-head map, and inspect ranked moves and search choices. Tap the visualizations to enlarge them and connect a move to its place in the output map. Sage was trained for Classic Chess; Jester was trained for UnCheck. These are neural predictions, not promises of perfect play. Choose your difficulty: • HIGH — neural predictions without lookahead • HIGHER — 100 search simulations • HIGHEST — 400 search simulations BUILT FOR PLAY AND EXPLORATION • Play as White or Black • Find compulsory capture sources in gold and targets in red • Tap a piece and a highlighted legal destination • Choose your pawn's promotion piece • Step backward and forward through the game • Review the final board with the winning king celebrated • Continue an unfinished game saved on your device • Enjoy subtle sounds and haptic feedback No account. No ads. No analytics or tracking. No cloud inference. Just two games, two bots, and a new reason to put your king in danger.