Go — Five AI Levels & Two Players

It uses area scoring for reliable automatic counting: stones and surrounded empty points score, with 7.5 komi for White. Suicide is forbidden, positional repetition prevents ko cycles, and two consecutive passes end the game. Stones left on the board count as alive, so unsettled groups should be played out.

The 9×9 board produces short, clear fights for Novice and Beginner play. The 13×13 board introduces opening plans and whole-board tradeoffs. The standard 19×19 board has the widest strategic scope and appears at Master level. The core rules stay the same.

Novice chooses among many reasonable points, Beginner emphasizes connection and atari, Intermediate evaluates replies, Advanced reduces randomness and protects groups more consistently, and Master uses 19×19 with the strongest reply check. Each band contains 20 levels, for 100 total.

The point may already be occupied, the move may leave the new group with no liberties without capturing anything, or it may recreate an earlier board position and violate the repetition rule used for ko.

Orthogonally connected stones of one color form a group. Adjacent empty intersections are liberties. When the opponent fills a group’s final liberty, every stone in that group is removed immediately. Diagonal contact does not connect stones.

No. Two people alternate Black and White on one device. Legal-move checks, captures, ko, and scoring all run locally in the browser.

The UTC date fixes the daily level and AI parameters. A shared link stores its level and random seed, so friends receive the same board size, computer strength, and decision conditions.

One pass only says the current player sees no useful move; the opponent may continue. Two consecutive passes signal agreement to score. If a group is clearly dead but remains on the board, keep playing until it is captured before both players pass.