12. model mate, by the horse

Helpmates in xiangqi

4 moves

Black moves first and both sides cooperate: Black, Red, Black, Red, and Red's second move mates. Black has 40 legal first moves and exactly one of them works. 14 pieces, Black 42.5 to Red 4 in material, mate by the horse. Themes: pure mate, model mate, Black blocks its own genera…