145. 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 1 legal first moves and exactly one of them works. 16 pieces, Black 43 to Red 12.5 in material, mate by the horse. Themes: pure mate, a piece already in the way, a piece ret…