How do you like this swindle?

12 Be2 creates a pattern that comes up time and time again - opposing bishops 2 squares diagonally apart with a knight inbetween. Look out for the knight to make a capture, (in this case on d4), so that it defends its bishop, even if the square it's capturing on is defended. In this position, after 12 ... c6, white needs to play a couple of preparatory moves before making this capture: 13 Nxb6 then if 13 ... axb6 as happened in the game, 14 Bxf6, and if black recaptures, then 15 Nxd4 wins a piece. The engine thinks that 14 ... Bxf3 is best here, sacing the queen, but a human is highly unlikely to play this and it's still advantageous to white.

In other positions, Nxd4 (for example) might be playable immediately. This is a pattern well worth learning, to play if you're on the right side of it, and to avoid if you're on the wrong.