85. pure 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 33 legal first moves and exactly one of them works. 17 pieces, Black 47 to Red 10 in material, mate by the horse. Themes: pure mate, a piece already in the way, a quiet firs…