1. The chessboard has 8 rows and 8 columns, totaling 64 squares.
2. At the beginning of the game, 4 black and white chess pieces are placed in the 4 squares in the center of the chessboard.
3. The black piece goes first, and the two sides take turns to place their pieces. As long as the black piece and any of their own chess pieces on the chessboard are on the same line (horizontal, vertical, or diagonal) and sandwich the opponent's chess pieces, they can turn the opponent's chess pieces into their own (just flip them over).
4. Each player's move must flip at least one piece according to the above rules. If there is no move to make, they must give up.
5. When both sides have no moves to make, the game ends, and the side with more chess pieces is the winner.