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Eight queens problem, eight queens problem is a chess background questions: How can the 88 chess board placed on eight queens so that any one can not directly eat other Queen Queen? To achieve this purpose, either two queens are not in the same a rampage, vertical or diagonal row. Eight queens problem can be extended to more general n-queens placed question: when the size of the board becomes nn, while the Queen has become the number n. If and only if n = 1 or n ≥ 4 time problems solvable.