61. pure 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 39 legal first moves and exactly one of them works. 16 pieces, Black 47 to Red 11 in material, mate by the chariot. Themes: pure mate, Black blocks its own general, Red capt…