圈叉游戏（二人轮流在井字形九格中画 O 或 X，先将三个 O 或 X 连成一线者获胜）a simple game in which two players take turns to write Os or Xs in a set of nine squares. The first player to complete a row of three Os or three Xs is the winner.
n.
1.
agameinwhichtwoplayersalternatelywrite '0' or 'X' onagridofninesquares, untiloneplayergetsthreeofthesamesymbolsinaline