Pearls in the Grid


by Henry E. Dudeney

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Nine pearls are placed in the cells of a 9x9 grid in such a way that no pearl is in the same row, column, or diagonal as any other one.

It is known that three pearls can be moved to adjoining cells (horizontally, vertically, or diagonally) and yet no pearl would be in the same row, column, or diagonal.

Can you figure out these three pearls and the adjoining cells they should be moved to?

Posted: April 4, 2007
PDF Version (68 KB)

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Pearls in the Grid 2   3-vs-2-feat-1
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