UnCheck Chess

A chess variant where getting attacked wins. UnCheck Chess is a focused, offline chess experiment built around two ways to play: • CLASSIC CHESS AGAINST SAGE — checkmate your opponent to win. The ordinary game. • UNCHECK CHESS AGAINST JESTER — begin your turn with your king attacked to win. Kings may enter attack and captures are compulsory. Expose your king, then force your opponent to leave at least one attack in place. Kings are never captured. Castling may cross attacked squares. A player with no permitted move draws, and ordinary insufficient-material draws are disabled in Uncheck. Two neural networks are waiting: • SAGE — its original normal-chess champion weights, unchanged • JESTER — a validated UnCheck champion, continued from the earlier Jester model Choose Classic Chess against Sage or UnCheck Chess against Jester. Each model uses the rules and winning condition it trained for. Then choose how hard it thinks: • LOW — the policy head alone: one pass, no lookahead • MEDIUM — a 100-position tree search • HIGH — a 400-position tree search Both models run entirely on your device. No connection or account is required. WHY IT IS DIFFERENT Most chess apps ask how strong a bot can be. This one asks what a network learns when the goal is turned inside out, then puts you in the same variant so you have to beat it there. Sage and Jester are neural chess models, not perfect oracles. Even a high-ranked move can miss a tactical reply. That uncertainty is part of the game. BUILT FOR A QUICK GAME • Play as White or Black • Tap any highlighted legal destination • See every compulsory capture source in gold and target in red • Choose every promotion piece • Review the game with forward and back history controls • Keep reviewing the board after the result, with the winning king celebrated • Inspect the bot's game-state, policy, value, and search data • Resume an unfinished game automatically • Hear subtle move, capture, and finish sounds • Feel lightweight haptic feedback • Play entirely offline No ads. No analytics. No tracking. Just chess, two variants, and two bots with very different training.