109. a piece already in the way, 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 51 legal first moves and exactly one of them works. 18 pieces, Black 49 to Red 13 in material, mate by the soldier. Themes: a piece already in the way, the general walks in,…