139. model mate, 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 1 legal first moves and exactly one of them works. 19 pieces, Black 53 to Red 13 in material, mate by the chariot. Themes: pure mate, model mate, the general walks in, Red c…