一字棋游戏，设有如图所示的九个空格，由A，B二人对弈，轮到谁走棋谁就往空格上放一只自己的棋子，谁先使自己的棋子构成“三子成一线”就取得了胜利。如果到棋盘上下满棋子的时候还没有一方构成 “三子成一线” ，那么当前棋局就为平局。

-Word chess games, with nine spaces as shown by the A, B two players, who turn to go out into space on playing chess who put an own pieces, the first to make their pieces constitute "　three sons, a line " on to victory. If the board full of pieces up and down when no one form of the " three children in a line,"　then the current chess game on for the draw.