1. g1f3  1... d7d5  2. g2g3  2... g8f6  3. f1g2  3... e7e6  4. e1g1  4... f8e7  5. d2d3 Nepomniachtchi chose the  King's Indian Attack for the decisive game. 5... e8g8  6. b1d2  6... c7c5  7. e2e4  7... b8c6 This can be considered Black's main line.