[%c_effect d7;square;d7;type;GreatFind;persistent;true]
1. d2d4  1... g8f6  2. c2c4  2... g7g6  3. b1c3  3... d7d5  4. g1f3  4... f8g7  5. h2h3 Who would have thought that after so many years of analysis, the Grunfeld Defense would be refuted by such an innocent move $2 Of course, I'm kidding. Everything still works fine with this excellent option for Black. But White's move is still curious, especially in this move order. We will get a transposition to more conventional lines in a few moves, and the idea of the pawn advance will become clearer. 5... e8g8  6. c4d5  6... f6d5  7. e2e4  7... d5c3  8. b2c3  8... c7c5  9. f1e2 Now White's idea is easier to understand. The pawn on h3 prevents the development of the bishop on g4. Both players follow a very theoretical line. 9... b8c6  10. c1e3  10... c5d4  11. c3d4  11... d8a5  12. e3d2  12... a5a3  13. d4d5  13... c6e5  14. e1g1 Sacrificing an exchange that is not accepted by Erigaisi. 14... c8d7  15. a1b1  15... d7a4  16. d1e1  16... e5d3  17. e2d3  17... a3d3  18. d2g5 All this was played at lightning speed. Now Erigaisi finally began to deliberate. 18... f8e8 \"O mais preciso\" (the most accurate). 19. e1b4 A novelty played quickly, certainly the result of preparation. 19... b7b5 Forced. 20. b1c1  20... a7a5  21. b4c5  21... d3e4 Black has options, but this is good enough. 22. f1e1  22... e4f5  23. g2g4 [%c_effect g4;square;g4;type;GreatFind;persistent;true] Maghsoodloo continues with his fantastic preparation. 23... f5c8 This move is the computer's first choice, but I think it came as a surprise, as the Iranian GM finally started to contemplate. 24. g5e7  24... b5b4 Erigaisi is a very combative player and is not afraid of a fight. He gives the queens a chance to stay on the board, certainly also thinking about his chances of winning. 25. c5e3  25... c8b7  26. d5d6  26... a8c8  27. f3g5 [%c_effect g5;square;g5;type;GreatFind;persistent;true] An excellent move, pressing the f7-point and also preparing the knight maneuver for e4. 27... c8c1  28. e1c1  28... b7d5 Centering the queen is rarely a bad idea. 29. e3f4 We are reaching the climax of this magnificent battle. This position is great for chess students who would like to practice calculating variations. 29... d5a2 [%c_effect a2;square;a2;type;Inaccuracy;persistent;true] This move gets Black into trouble. There are safer options. 30. c1c4 [%c_effect c4;square;c4;type;GreatFind;persistent;true] Cutting off the f7-pawn defense. 30... f7f5 [%c_effect f5;square;f5;type;Mistake;persistent;true] This move loses, but the position is so difficult to calculate that both players are more than forgiven for not always choosing the best moves. 31. g4f5  31... h7h6  32. f5f6 Tempting, but not the best. There are two winning moves, one more difficult than the other. 32... h6g5  33. f6f7  33... g8h7  34. f7e8q  34... g5f4 [%c_effect f4;square;f4;type;GreatFind;persistent;true] Capturing the right queen. 35. e8f7  35... a4e8 [%c_effect e8;square;e8;type;Mistake;persistent;true] The decisive mistake. 36. f7f4  36... b4b3 