Latin squares and 3D chess

In a n×n Latin square, each of the numbers 1 through n appears exactly once in each row and column. For example, the 5 × 5 square below is a Latin square. If we placed a rook on each square numbered 1, the rooks would not attack each other since no two rooks would be […] The post Latin squares and 3D chess first appeared on John D. Cook....

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