African Board Game
Achi is a board game for two people. You can play against the computer or against another person. It is similar to tic-tac-toe, except that you get to move your pieces after you put them all down.
You win the game if you are the first player to form a mill or stalemate your opponent. A mill is three pieces of the same color in a row or in a column. A player who has no legal moves is stalemated. Note that three pieces of the same color on one of the diagonals is not a win.
A game consists of two stages. In the first stage, the players alternate moving one of their unplayed pieces onto a vacant point of the board. The player who has the white pieces goes first. If nobody wins during this phase, and all eight pieces have been played, then the second stage begins.
In the second stage, the players alternate moving one of their pieces to the vacant point on the board. You can move a piece only if it is immediately adjacent to the vacant point, and both are connected by one of the straight lines drawn on the board.