Streak
0
Best
—
Your turn
Gomoku (Five in a Row) — place stones on a 15×15 board and connect five before the AI does.
A 15×15 board starts empty. You are black, the AI is white. Black moves first.
Tap any empty cell to place a black stone. The AI then plays a white stone in reply.
The first player to line up five of their stones in a row — horizontally, vertically, or diagonally — wins the round.
A win adds 1 to your streak and starts a new round. A draw (board full with no winner) keeps your streak. A loss ends the game. The AI gets sharper as your streak grows — it starts looking ahead to set up and block double-threats (forks).
Goal: longest winning streak.
Five in a row is won by threats, not by quietly building your own line. The key shape is the "open three" — three of your stones in a row with both ends free — because it forces the opponent to block or you make four and then five. Conversely, the instant the AI lays an open three, you must block it that turn; ignore it once and you have already lost.
The real winning weapon is the double threat, or fork: a single stone that creates two separate open threes (or an open three plus an open four) at once, so the opponent can only stop one and you complete the other. Play near the centre where lines run in every direction, build threats that also block the AI, and always scan the diagonals, which are the lines players miss most. As your streak grows the AI starts seeing forks early, so disguise your setups and keep two threats brewing at all times.