game rules:
1. There are a number of black and white chess pieces scattered on the Zhenlong chessboard;
2. Draw a closed circuit through all the chess pieces on the chessboard;
3. If a white chess is passed, it will pass in a straight line, and if a black chess is passed, a 90-degree turn will pass;
4. The blank grid can not pass through, or pass through in a straight line or turning.
1. There are a number of black and white chess pieces scattered on the Zhenlong chessboard;
2. Draw a closed circuit through all the chess pieces on the chessboard;
3. If a white chess is passed, it will pass in a straight line, and if a black chess is passed, a 90-degree turn will pass;
4. The blank grid can not pass through, or pass through in a straight line or turning.
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