Achi is a two-player abstract strategy game from Ghana. It is also called tapatan. It is related to tic-tac-toe, but even more related to three men's morris, Nine Holes, Tant Fant, Shisima, and Dara, because pieces are moved on the board to create the 3-in-a-row. Achi is an alignment game.

There are two versions of this game. In one version, each player has four pieces to drop. This is the version described below. In another version, each player has only three pieces to drop, which makes it identical to three men's morris.

A 3×3 board is used. Three horizontal lines form the three rows. Three vertical lines form the three columns. Two diagonal lines connect the two opposite corners of the board. The board is easily drawn on the ground or paper.

Each player has four pieces. One plays the black pieces, and the other plays the white pieces; however, any two colors or distinguishable objects will suffice.

1. The players take turns to place one of their counters on a point where lines join.
2. When all eight counters have been placed, each player can move along a line to an adjacent empty point.

The winner is the first player to create a 3-in-a-row of one's counters either horizontally, vertically, or diagonally.

• Picaria
• Three men's morris, also called Tapatan—a cited predecessor
• Nine Holes

• https://web.archive.org/web/20080828074020/http://www.math.niu.edu/~rusin/uses-math/games/rows/misere
• Play online https://mpaulweeks.github.io/achi/
• Play online https://parlor-games.azurewebsites.net/game/ternilapilli/
• https://boardgamegeek.com/boardgame/28931/achi

v t e Tic-tac-toe
Variants	3D tic-tac-toe Gomoku Notakto Treblecross Number Scrabble Order and Chaos Pente Quantum tic-tac-toe Renju SOS Ultimate tic-tac-toe Wild tic-tac-toe
Related concepts	m,n,k-game nd game Kaplansky's game Harary's generalized tic-tac-toe Hales–Jewett theorem Strategy-stealing argument Futile game Paper-and-pencil game
Similar games	Nine men's morris Score Four Tic-Stac-Toe Gobblet Quarto Three men's morris Nine Holes Achi Connect Four Connect6 OXO Toss Across Pentago