24. a piece returns where it came from, 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 50 legal first moves and exactly one of them works. 19 pieces, Black 53 to Red 4 in material, mate by the soldier. Themes: a piece returns where it came from, the general wa…