A strong and cold-blooded move, simply protecting the e3-pawn.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... g8e7 This opening choice probably came as a surprise to Lagarde. 4. b1c3 The third most popular move and one with a good reputation. 4.0-0, 4.c3 and 4.d4 are also usually played. 4... e7g6  5. d2d4  5... c6d4  6. f3d4  6... e5d4  7. d1d4  7... c7c6  8. b5e2  8... d8b6 This position has occurred in many games of strong GMs. 9. d4d3  9... f8e7  10. f2f4 A new move and probably a result of over-the-board inspiration. 10... e8g8 Praggnanandhaa follows the aforementioned principle and decides to castle. 11. h2h4  11... d7d5 [%c_effect d5;square;d5;type;GreatFind;persistent;true] Every schoolboy knows that against an attack on the flank, you should strike on the center. This is easy on paper, but difficult to replicate in our games. This is a textbook example. 12. h4h5 [%c_effect h5;square;h5;type;Mistake;persistent;true] 12... d5e4  13. d3g3 The only way to justify White's previous move. 13... g6h4 [%c_effect h4;square;h4;type;GreatFind;persistent;true] I believe the French GM underestimated the strength of this move. 14. h1h4  14... b6g1  15. e2f1  15... e4e3 [%c_effect e3;square;e3;type;GreatFind;persistent;true] This is the point. The rook should not be taken yet. Black is threatening 16...Qf2+. 16. c3d1 The only defense.