[%c_effect d5;square;d5;type;GreatFind;persistent;true] Shutting out the black bishop.
1. d2d4  1... g8f6  2. c1f4 Firouzja is extremely successful with his London system, introducing a bunch of novelties and concepts at the top-level games he has played. 2... b7b6 \"Some kind of freestyling.\" (Caruana) 3. c2c4  3... c8b7  4. b1c3  4... d7d6 Caruana decided that the King's Indian setup might be a good idea against White's Bf4. 5. g1f3  5... g7g6 