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The third grade elementary school mathematics book 2 Unit 1 How to make money for black and white chess?
Each chess piece can only reach an adjacent box at a time, or skip a box and can't jump forward;

No matter which chess piece can return to the grid it has been to;

There cannot be more than one chess piece in each square; Jump off the white chess piece.

Twenty-four moves can reverse the position of black and white pieces.