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I see that you've solved it, but ericetlafindumonde provided a thorough and comprehensive answer.

KolesoYour first comment: "Black checkmate in two moves", and second "White horse h4 on G6" are incomplete. I was looking for just a simple answer like: Knight from h4 to g6, black rook takes, kight from e5 takes the rook on g6, and that's a checkmate, or simpler with chess notation (1. Nhg6-Rxg6 2. Nxg6#) Have a nice evening, bro.