This backgammon is a chess game of man-machine battle. During the game, only black and white chess pieces are used, and the two sides take turns to play on the intersection line of the 15x15 board. At the beginning of the game, the sunspots play first, and the first mover is randomly determined by the computer. There are no special rules in this game. As long as one of the two sides, regardless of the vertical, horizontal or oblique direction, is the first to connect the five pieces into a line, it is the winner of the game.