151. 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 6 legal first moves and exactly one of them works. 8 pieces, Black 8 to Red 11 in material, mate by the chariot. Themes: a piece already in the way, the general walks in, Bl…