1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. b1c3  4... f8e7  5. c1f4 In the earliest days of the Queen's Gambit Declined, the bishop was almost always developed to g5. For some time now, however, elite grandmasters have favored this move and it has become the main line. 5... e8g8  6. e2e3  6... c7c5 The classical way of playing. 6...Nbd7 is very popular nowadays, but Nepomniachtchi is clearly using his world championship preparation. 7. d4c5  7... e7c5  8. a2a3  8... b8c6  9. d1c2 