H2+4 also checkmates. On Black’s right wing, the spots B31 and B42 are equally vulnerable to an enemy Horse.
PxH to win the exchange? “No!” at its loudest.
Among the patterns of Smothered Mates, this one has a unique name in Chinese: 闷宫. We shall just call it Cannon Smothered Mate.
Of course, in this position you may replace the Pawn with a Chariot.
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