You should see that Black’s king and queen are on the same file with no pawns nor anything else between or behind them. Go for a tactic on the file. Black’s king is up off the back rank and White’s rook is beneath it, a classic invitation to a skewer. The only hitch is that the square White needs—f8—is guarded by Black’s knight. But notice that White’s rooks are doubled on the back rank. Part of the power of doubled rooks arises from the fact one can be sacrificed on a square to then make it a safe place for the other to land. So go ahead and play the check Rf8. Black replies NxR, and now White has RxN+, reestablishing his second rook on f8 now that Black’s defense of the square has been exhausted. Black has to move his king and allow his queen to be taken with RxQ.