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Description of the problem eight queens problem 【】 In an 8 × 8 chess board to place eight queens, requires that each queen is not between the 22 " conflict" , that is, no one queen can " eat" any other a queen, a simple to say is that no two Queens occupy the board on the same row or column or the same diagonal, that is, in each row, vertical column, the column have only one queen inclined.