Go, known as Weiqi in Chinese and Baduk in Korean, is an ancient board game of surrounding territory and capturing stones. Play Go Board Game free in your browser against adjustable AI. No download or account.
KataGo in your browser at ten levels, across three model sizes; each model downloads only when you pick a level that uses it. Play 9×9, 13×13 or 19×19 under Chinese, Japanese or Korean scoring. Hint marks the top candidates with their win rates. Daily tsumego.
How You WinSurround more of the board than your opponent. After both players pass in succession the game ends and is scored under the current ruleset — area scoring for Chinese rules, territory scoring for Japanese and Korean — plus komi for White. The higher score wins, and because komi carries a half point there are no draws.
Hint marks a few candidate points on the board with their win rates, Undo takes back the last round, and Resign ends the game. After the game, Review opens it from History move by move, and Analyze finds the moves where the win rate dropped most and marks a better one on the board.
It is free, with no download and no account: the board opens in the browser on a computer or a phone. The Go AI runs on your own device, and an unfinished game comes back when you return in the same browser.
Yes. Choose Black or White under Side and the computer takes the other colour. There are ten levels and a first visit starts at level 2; if you are new to Go, begin at level 1 or 2 on the 9 × 9 board and move up when you win comfortably. You can swap sides in the middle of a game, or switch to 2 players and carry on from the same position.
The open-source engine KataGo, with three sizes of model: about 3.6 MB for levels 1 to 7, about 11 MB for levels 8 and 9, and about 98 MB for level 10, each downloaded only when you choose a level that uses it. Levels 1 to 4 deliberately pick from candidates that give away a few points; from level 5 up, strength comes from the number of search visits and the model size. Level 10 needs a device that can run the large model and is greyed out otherwise. Everything runs locally in your browser.
Yes. Set Side to 2 players and take turns on the same phone or computer, Black first; Undo takes back one move at a time. There are no online rooms, so you cannot play someone who is not with you.
9 × 9 has only 81 points and a game takes twenty or thirty moves, which suits beginners; 13 × 13 is good for practising the middle game; 19 × 19 is the full board used in tournaments. Chinese rules count area with 7.5 komi, and Japanese and Korean rules count territory with 6.5 komi. Japanese rules forbid only retaking a ko at once, while Chinese and Korean rules forbid any repeated position. Changing the board or the rules starts a new game.
Yes. Puzzles & practice has more than 900 life-and-death problems covering liberties, captures, ko fights and tesuji. Work through them as a level path of 70 stages, or solve the daily puzzle. They are free and need no account.
Yes. Review opens History, where every game played on this device can be replayed move by move, with your wins and losses at each level. Analyze finds the moves where your win rate dropped most and marks a better move on the board. Games are stored only in your browser.
No. Hint can be used on any move: the same model thinks longer, for up to 3 seconds, and marks a few candidate points on the board with their win rates. Against the computer Undo takes back two moves, yours and the computer's, and can be pressed again to go further back.
Black and White take turns placing stones on the intersections; a group whose liberties are all filled is captured, and at the end the side with more area wins. Chinese rules count the stones on the board plus the surrounded points, Japanese and Korean rules count the surrounded points plus captured stones, and White adds komi. Komi includes a half point, so Go has no draws. The full rules page covers ko, seki and counting in detail.
Yes. 19 × 19 is the standard board and 9 × 9 and 13 × 13 are the usual smaller ones, and captures, illegal points, ko and the final count all follow the rules without simplification. Go is called weiqi in Chinese and baduk in Korean. Gomoku uses the same board and stones but is an entirely different game, with its own page on this site.
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