Eight queens puzzle
MATHEMATICAL CHESS PROBLEM OF PLACING EIGHT CHESS QUEENS ON AN 8×8 CHESSBOARD SO THAT NO TWO QUEENS THREATEN EACH OTHER
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The eight queens puzzle is the problem of placing eight chess queens on an 8×8 chessboard so that no two queens threaten each other; thus, a solution requires that no two queens share the same row, column, or diagonal. There are 92 solutions.