1. e2e4  1... c7c5  2. g1f3  2... e7e6  3. b2b3 A nice side-line to avoid the heavy theory. 3... b7b6 This is considered to be one of the most plausible replies for Black. The reason: White does not seem to have a convenient way to defend his e4-pawn after the coming Bc8-b7 development. 4. c1b2  4... c8b7  5. b1c3 More or less forced, but now the knight blocks his own bishop. 5... g8f6  6. e4e5  6... f6e4  7. c3e4  7... b7e4  8. d1e2  8... e4b7 Andreikin achieved what he wanted: he locked the long diagonal, but at the expense of a few tempi. Giri's next move is a novelty. 9. h2h4 An idea borrowed from the French defense. Even though the black pawn is on the d7 rather than the d5-square, the kingside attack plan remains White's primary idea. 9... b8c6  10. h4h5 Postponing castling for the time being. That is the most unpleasant strategy for Black, who seems to lack many useful moves. 10... c6b4  11. d2d3  11... b6b5 All of this seems logical as Black needs to do something on the opposite wing, but this pawn may turn itself into a weakness. 12. a2a3  12... b4c6 Finally abandoning the idea of a bishop swap. 13. e2d2 An accurate move. 13... a8c8 Black is getting ready to meet long castling. 14. h1h3 Once again, the nastiest way to play it. The rook would be working perfectly along the third rank. 14... d8c7  15. e1c1 The time had come. 15... c6a5 A difficult decision to make. 16. f3g5 The knight is heading to the e4-outpost and then might land very, very close to the enemy king. 16... f8e7 At last, the kingside is moving, but this might be a bit too late. 17. h3g3 The black kingside is on the verge of collapse. 17... c5c4 Last chance. Andreikin needs to muddy up the waters. 18. d3c4  18... b5c4  19. b3b4  19... h7h6  20. g5f7 Giri went for the most tempting line. 20... e8f7  21. b4a5 Obvious, and not optimal. 21... b7d5  22. d2f4  22... f7g8 The king looks safer here, but it blocks the rook from entering the battle. 23. d1d5 A nice concept $1 23... e7g5 The only move. 24. g3g5 