Problem of the Week 1156

A 3-Dimensional Chessboard

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Solution Notes

Problem 1156 was solved by Joseph DeVincentis, John Shrimpton, John Sullivan and John Guilford.

Sullivan's solution is short: "Just take 2d-checkerboards and stack them on top of each other, but instead of swapping colors every layer, swap only every second layer."

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© Copyright 2012 Stan Wagon. Reproduced with permission.