Do you see a vulnerable pattern in Black’s position? Where does he have pieces aligned? His queen is in front of his rook on the same diagonal, a pattern that we have seen can often yield a bishop skewer that wins the exchange. White has a bishop on c3 that can get to the diagonal easily enough and would have protection on e5 from the knight on f3. Most of the elements of a skewer thus are in place, but there is a pawn in the way on d6. White can't take anything it protects, for it protects nothing, and anyway that method works best when you want to draw a pawn off of a file rather than a diagonal. Better to just capture it and invite a recapture that consolidates the line down to two Black pieces. White can take the irritating pawn with a pawn of his own via c5xd6. Indeed, you see that this would be a pawn fork of White’s queen and knight. To avoid the loss of a piece Black has to play Qxd6. Now comes White’s Be5, and Black’s queen and rook are skewered. Black moves his queen over to b6 so that it can recapture after White plays BxR, but White still wins the exchange.