Your only piece that can do any checking is the queen, at g7 and g8. There is no apparent follow-up if it goes to g8 and is taken by Black’s king. But now suppose White plays Qg7 and look at the resulting position. Notice the significance of the pawn at f6; it means Black would have no choice but to play QxQ. You still are thinking in checks, so look for the next one and arrive at the natural recapture f6xQ+. Again Black then has only one legal move: Kg8. Continue to be relentless in looking for the next check and you come to Ne7+—a fork of Black's king and c8 rook. White nets a rook with the sequence.