QUEENS AND BISHOP PUZZLE

It will be seen that every square of the board is either occupied or attacked. The puzzle is to substitute a bishop for the rook on the same square, and then place the four queens on other squares so that every square shall again be either occupied or attacked.

逻辑学 -> 推理/逻辑组合数学 -> 案例分析/检查案例 -> 过程/程序谜题和画谜

来源：

Amusements in Mathematics, Henry Ernest Dudeney 问题 313

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