The crafty oblique movement of the Horse, augmented with the heavy firepower of two Chariots, creates many brilliant checkmate routines.
The sacrifice of the Chariot at B40 is a typical tactic. On the second move, if Red checks with the other Chariot, it will take him 3 additional moves to win.
In the end, if Black advances his King, he will be Smothered Mated. C8-2 is also useless as the threat is still there after Red’s R6=3 capturing the Elephant.
What if Black moves his King out of check on move #6/11? See the next diagram.
If Black answers the first Horse check with K6=5, he will be greeted with the Moat Horse checkmate after Red’s H5+7