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No Four in a Row 禁止四子棋

No Four in a Row曾出现于第23届WPC Round 3 第15-16题。

规则

No Four in a Row,23rd WPC Instrucion Booklet © 2014, UK Puzzle Association
No Four in a Row,23rd WPC Instrucion Booklet © 2014, UK Puzzle Association
规则
将完整的俄罗斯方块组合放入格子中, 这些俄罗斯方块只能旋转, 不得翻转。方块彼此间不得相触, 在每个空格中放入 O 或是  X, 使得最后盘面上直向, 横向或斜向, 都不会有连续四个O 或 X 出现。
Rule
Place either an 'X' or an 'O' into each empty cell such that four consecutive 'X's or 'O's do not appear horizontally, vertically or diagonally.
No Four in a Row答案,23rd WPC Instrucion Booklet © 2014, UK Puzzle Association
No Four in a Row答案,23rd WPC Instrucion Booklet © 2014, UK Puzzle Association

参考资料