163. pure mate, by the soldier

Helpmates in xiangqi

4 moves

Black moves first and both sides cooperate: Black, Red, Black, Red, and Red's second move mates. Black has 3 legal first moves and exactly one of them works. 24 pieces, Black 53 to Red 14 in material, mate by the soldier. Themes: pure mate, a piece already in the way, the general…