1. d2d4  1... g8f6  2. c1g5  2... d7d5  3. e2e3  3... c7c5 This variation is considered one of Black's best options against the Trompowsky. 4. g5f6  4... g7f6  5. d4c5  5... e7e6  6. g1f3  6... f8c5  7. f1e2  7... e8g8  8. e1g1  8... c5e7 [%c_effect e7;square;e7;type;Interesting;persistent;true] A clever move, probably prepared beforehand. The bishop is useful on e7, as it can later be positioned on f6 (with f6-f5 and then Bf6). Meanwhile, Black fights against White's most active plan (c2-c4) by preparing to exchange queens. 9. c2c4  9... d5c4  10. d1c2  10... d8c7 [%c_effect c7;square;c7;type;GreatFind;persistent;true] This is the idea of not developing the knight on c6 so soon. 11. b1d2  11... b8d7  12. a1c1 [%c_effect c1;square;c1;type;Inaccuracy;persistent;true] Another case of the \"wrong rook.\" I think it was Capablanca that once gave the right advice whenever you are in doubt about which rook you should move to a given file: \"Decide which rook looks the most natural to you. Then play the other one\". 12... b7b5  13. a2a4  13... a7a6  14. f3d4 White regains the pawn after the b2-b3 break, but Black will be better anyway. 14... c8b7 [%c_effect b7;square;b7;type;GreatFind;persistent;true] 15. b2b3  15... d7c5 [%c_effect c5;square;c5;type;GreatFind;persistent;true] 16. a4b5  16... a6b5  17. b3c4  17... b5b4 [%c_effect b4;square;b4;type;GreatFind;persistent;true] A typical device that has been seen many times in similar structures. The white c-pawn is blocked while the black b-pawn is dangerous. 18. c1b1  18... c5a4 The knight wants to reach c3. 19. e2f3  19... b7f3  20. d4f3 [%c_effect f3;square;f3;type;Inaccuracy;persistent;true] 20... a4c3 Now Black has a clear advantage with the monster knight. 21. b1a1  21... f8d8  22. f3d4  22... f6f5 [%c_effect f5;square;f5;type;GreatFind;persistent;true] The right plan. The bishop can go to f6, and Black can break with f5-f4. 23. c2b3  23... f5f4  24. d2f3  24... e7c5  25. g1h1  25... a8a1  26. f1a1  26... c7b7  27. a1a5 This is not good, but White's position was very bad anyway. 27... c3e4 