A good move and also a novelty.
1. e2e4  1... e7e5  2. f2f4 The King's Gambit is not a good choice for White in standard super grandmaster play, but in rapid games or amateur tournaments it's possible to have some fun with it. 2... e5f4  3. g1f3  3... g8e7 Only the seventh-most popular move. 4. d2d4  4... d7d5  5. f1d3 Nepomniachtchi had played this move before. 5... c7c5  6. b1c3  6... c5d4  7. f3d4 