While studying opening theory, I came across what Capablanca called “Petite Combination”:
Solution: White plays 18.Nxa5! Qxa5 19. Bd2
Looking at the Chigorin Variation of the Spanish Opening over the years, I noticed that the weakness of the dark squares on the queenside after Black's a6 and b5, highlighted by White placing his knight on b3 and bishop on d2, is a common theme. Here it is exploited in its purest form!