1. d2d4  1... g8f6  2. c1g5 Even Carlsen recognizes the brilliant discovery of Octávio Trompowsky, the 1939 Brazilian chess champion who supposedly invented or popularized this opening. 2... d7d5 Black ignores the knight capture on f6, which was assumed to be a \"threat\" when this variation was invented. White, for his part, completely ignores the knight, even when the bishop is provoked by the h-pawn. Such are modern times. 3. e2e3  3... c7c5  4. b1d2  4... b8c6  5. c2c3  5... c5d4  6. e3d4 