Knowing the ideas and themes of basic structures, like the Carlsbad (the Hedgehog/Maroczy, the Stonewall, Isolated and Hanging pawn structures, etc.), makes it much easier to make the right decision in a sharp situation. I was a bit puzzled about some decisions during the 12:th game of the last World Ch. Match, between Ding Liren and Nepomniachtchi.
The last part of the game have probably been more seriously commented elsewhere. I wanted to focus on the Carlsbad part.