1. d2d4  1... d7d6  2. e2e4  2... g7g6  3. g1f3  3... g8f6  4. b1c3  4... f8g7 Nepomniachtchi needs to win,  therefore he plays the "irregular" Pirc. 5. c1e3  5... c7c6  6. d1d2  6... d8a5  7. f1d3  7... c8g4  8. f3g1  8... e7e5  9. h2h3 