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The ancient and profound game of Go. Supports 9×9/13×13/19×19 boards with full rules: liberties, captures, ko rule, suicide prohibition, plus both Chinese (area) and Japanese (territory) scoring. AI uses Monte Carlo simulation and alpha-beta pruning across four difficulty levels (easy/medium/hard/expert). Includes optional per-player clock, undo, SGF export, and game stats.
Black and White take turns placing stones. The player with more territory wins. After two consecutive passes, the game ends and scores are calculated using Chinese rules (7.5 komi).
The goal of Go is to control more territory than your opponent. Black plays first, players alternate placing stones on intersections. Stones with no liberties (fully surrounded) are captured. After both players pass, the game ends and is scored using Chinese rules: Black score = black stones + black territory; White score = white stones + white territory + 7.5 komi. 9×9 boards use MCTS (Monte Carlo Tree Search); 19×19 boards use heuristic play enhanced with an influence map.
• Click on an intersection to place a stone • Black plays first, players alternate • Stones with no liberties are automatically captured • Ko rule: cannot immediately recreate the previous board position (red circle marks the ko point; status bar shows ko status) • Suicide rule: a move that leaves your own group with no liberties (without capturing) is illegal • Pass button: skip your turn; two consecutive passes end the game • Resign button: concede the game • Undo button: revert the last move (U) • Keyboard: U=undo, P=pass, N=new game, E=export SGF • Supports 9×9 / 13×13 / 19×19 board sizes • Play vs computer (easy/medium/hard/expert) or 2-player hotseat • Toggle scoring rule: Chinese (area) or Japanese (territory) • Optional per-player clock (1/5/15 min, overtime loses) • Export SGF game record and view match stats
• Beginners should start with 9×9 to grasp territory concepts faster • Corners are gold, sides are silver, center is grass: prioritize corners, then edges, then center • Keep your stones connected to maintain liberties and avoid capture • During a ko fight, you must play elsewhere first (find a ko threat) before recapturing • Never fill your own eye — eyes are the foundation of group survival • Two eyes = alive: a group with two real eyes cannot be captured • Passing isn't just giving up — it's also how you confirm the game is over • 9×9 uses MCTS: easy=100 / medium=500 / hard=1500 / expert=2500 simulations, 3s time limit • 19×19 uses influence-map heuristic: evaluates stone radiation for better territory estimation • Status bar shows current simulation count or heuristic info during AI thinking