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Difficulty: 3 of 5 Latest: 18 Queens Rating: 2.33
On the 4x4 board below, two white and two black queens are placed so that no queens of one color attack any queen of the other color.

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Find a way to place 9 white queens and 9 black queens on an 8x8 chessboard in a similar fashion.
(Solution Posted, 6 Comments) Submitted on 2008-03-25 by Brian Smith   
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