53
This number is a prime.
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It is possible to place eight queens on a standard chessboard in which only 53 squares are under attack. Is this the minimum solution? (Update: Mike Keith has shown that 53 is indeed the minimum and that there are seven distinct solutions!) [Madachy]
Submitted: 2008-03-20 02:36:23; Last Modified: 2024-01-19 17:53:31.
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