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8(n) queens puzzle

The eight queens puzzle is the problem of putting eight chess queens on an 8×8 chessboard such that none of them is able to capture any other using the standard chess queen's moves. This means it is as if all the queens are different colours. The queens must be placed in such a way that no two queens would be able to attack each other. Thus, a solution requires that no two queens share the same row, column, or diagonal. The eight queens puzzle is an example of the more general n queens puzzle of placing n queens on an n×n chessboard(n ≥ 4).

-- Wikipedia


The eight queens puzzle has 92 distinct solutions. If solutions that differ only by symmetry operation (rotations and reflections) of the board are counted as one, the puzzle has 12 unique solutions
The script uses backtracing to find all the distinct solutions for "n queens puzzle" problem

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