Right! Knight moves to F4 sealing off any escape from the corner for the black king. After King moves to H7, Bishop to F8 forces K to H8, then knight to E6 forces black king to H7, then knight checks at G5 forcing king back to H8, then bishop mates at G7! Complicated!
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Since you got this correct you get to know the ninth letter of the
password to the game page: T!