31. Black blocks its own general, by the soldier

Helpmates in xiangqi

4 moves

Black moves first and both sides cooperate: Black, Red, Black, Red, and Red's second move mates. Black has 52 legal first moves and exactly one of them works. 11 pieces, Black 33 to Red 4 in material, mate by the soldier. Themes: Black blocks its own general, Red captures on the…