S2·E11 Mohist War At the Kingly Path

The original road suddenly cllapses and the three have to separate. Shaoyu walks into a chamber and the trap forces him to play a chess game, not the Go chess game in which the chessmen kill each other, but a reversi chess game in which the chessmen turns enemies to friends. Shaoyu was proud of his chess skill, but after a while he loses his priority and his life is threatened by the trap. He recalls his father's death on the battlefield, and tries his best to win the game. He finally wins the game and a weird weapon shows up before him.