1. d2d4  1... d7d5  2. c2c4  2... e7e6  3. g1f3  3... g8f6  4. b1c3  4... f8b4 Sargissian is an expert in the Queen's gambit declined (4...Be7), but he has recently added the slightly more dynamic Ragozin defense to his repertoire. 5. d1a4 This check forces Black to put his knight in front of the c-pawn, which could be considered a small opening achievement for White. Nevertheless, practice has shown that Black obtains good counterplay by focusing on …e6-e5 instead of the usual …c7-c5 break in this type of position. 5... b8c6  6. e2e3  6... e8g8  7. c1d2 White prepares to play 8.a3 when he could recapture with the bishop on c3 if Black goes 8...Bxc3. 7... d5c4 This is the main line. Usually, Black waits with this capture until White moves his light-squared bishop, but here he wants to secure the d6-retreat for his bishop. 8. f1c4  8... b4d6  9. a4c2 There is no way to prevent Black's central break, so Gukesh recentralizes his queen. All this is well-known opening theory, anyway.