Eight queens problem is an cient and well-known problem is a typical example of backtracking algorithms. The problem is that the nineteenth century the famous mathematician Gauss 1850: Under the 8X8 grid placed on the eight chess queens, so that it can not attack each other, that any two queens can not be in the same line, same column or the same slash and asked how many kinds of pendulum method. Gaussian that 76 kinds of programs. 1854 in Berlin chess magazines published by different authors on 40 different solutions, then someone with a graph theory method to solve the 92 kinds of results. After the invention of the computer, there are several ways to solve this problem.

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