1. g1f3  1... d7d5  2. g2g3  2... g8f6  3. f1g2  3... c7c6  4. c2c4  4... d5c4  5. e1g1  5... e7e6  6. a2a4 White follows a plan to regain the pawn on c4. It's also possible to sacrifice it. 6... b8d7  7. d1c2  7... e6e5 An interesting and aggressive plan, trying to exploit the queen's positioning on c4. 8. c2c4  8... d7c5 This is the idea: Black prepares Be6, attacking the queen, when the knight can then go to b3. 9. f3g5 The knight creates a mating threat and takes away the bishop's e6-square, but White needs to justify his plan before Black can play h7-h6. 9... c5e6  10. d2d3  10... a7a5 I like this move, fixing the structure on the queenside before White can get the pawn to b4. 11. b1a3  11... e6g5 Black has other good options. 12. c1g5  12... h7h6 A provocative move that is objectively fine, but makes Black walk on a tightrope due to the lack of piece development. 12...Be6 or 12...Be7 is safer. 13. g5f6  13... d8f6  14. f2f4 White exploits the advantage to start an attack. 14... e5f4  15. f1f4  15... f6b2 A losing move. Tabatabaei probably considered only the capture on f7 and forgot about another, much deadlier one. 16. g2c6  16... b7c6  17. c4c6 The black king cannot be protected from the coordinated attack of queen, two rooks, and a knight. 17... e8e7  18. c6c7  18... e7e8  19. c7f7  19... e8d8  20. f7d5  20... d8e8  21. a1b1  21... b2a3 