66. double check, 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 16 legal first moves and exactly one of them works. 6 pieces, Black 6.5 to Red 6.5 in material, mate by the soldier. Themes: double check, Black blocks its own general, the…