1. c2c4  1... e7e5  2. b1c3  2... f8b4  3. c3d5  3... b4e7  4. g1f3  4... d7d6  5. d2d4  5... g8f6  6. d5c3 White has more space and is unwilling to trade. This move  is highly appreciated by the former world champion. Nepomniachtchi is  deviating from a recent game. 6... e5d4  7. f3d4 