164. a piece already in the way, by the chariot

Helpmates in xiangqi

4 moves

Black moves first and both sides cooperate: Black, Red, Black, Red, and Red's second move mates. Black has 4 legal first moves and exactly one of them works. 18 pieces, Black 49 to Red 13 in material, mate by the chariot. Themes: a piece already in the way, the general walks in,…