131. discovered mate, by the cannon

Helpmates in xiangqi

4 moves

Black moves first and both sides cooperate: Black, Red, Black, Red, and Red's second move mates. Black has 43 legal first moves and exactly one of them works. 18 pieces, Black 47 to Red 15.5 in material, mate by the cannon. Themes: discovered mate, a piece already in the way, the…