context: 1. d2d4 Gukesh changes his opening move after a loss in the first game when facing the French Defense. The die-hard supporters of this defense, of which there are plenty, must be really happy. 1... g8f6  2. g1f3  2... d7d5  3. c2c4  3... e7e6 The nuances of opening play in a match are very interesting. Hundreds of hours of analysis are devoted not only by the players who are currently on the board, but by many strong grandmasters, some of whom remain anonymous. New ideas are demonstrated and chess players from all over the world immediately begin to study them, leading to a great advance in opening knowledge. 4. c4d5 