84. 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 44 legal first moves and exactly one of them works. 18 pieces, Black 42 to Red 8 in material, mate by the horse. Themes: pure mate, a piece already in the way, the general w…