Now Black is a pawn up, but White has enough compensation to equalize.
1. d2d4  1... d7d5  2. c2c4  2... c7c6  3. g1f3  3... g8f6  4. e2e3  4... e7e6  5. f1d3  5... b8d7  6. b2b3  6... f8d6  7. c1b2  7... e8g8  8. e1g1  8... b7b6  9. b1c3  9... c8b7  10. d1e2  10... d8e7 A typical position from the Semi-Slav Defense. 11. f1e1  11... c6c5 A little rushed. In these positions it'ss usually better to take a while to advance in the center, and this applies to both sides. 12. c4d5  12... e6d5  13. d3a6 [%c_effect a6;square;a6;type;GreatFind;persistent;true] The bishop exchange favors White, as the d5-pawn becomes a weakness. 13... b7c6 [%c_effect c6;square;c6;type;Inaccuracy;persistent;true] This is wrong, due to White's next move. 14. c3b5 [%c_effect b5;square;b5;type;GreatFind;persistent;true] 14... c6b5  15. a6b5 White has the pair of bishops and pressure on Black's center with a comfortable advantage. 15... e7e6  16. a1d1  16... f8d8  17. d4c5  17... b6c5  18. b3b4 [%c_effect b4;square;b4;type;Interesting;persistent;true] An interesting pawn sacrifice, although not necessary. 18... c5b4 It's better to suffer a pawn up. 19. f3d4  19... e6e4 [%c_effect e4;square;e4;type;GreatFind;persistent;true] 20. f2f3  20... e4e5 [%c_effect e5;square;e5;type;Mistake;persistent;true] This makes things worse. 20...Qh4 and 20...Qg6 are dangerous but better. 21. g2g4 [%c_effect g4;square;g4;type;GreatFind;persistent;true] A great way of defending the h2-pawn while supporting a knight jump to f5. 21... a7a6  22. b5c6  22... a8c8  23. c6b7  23... c8c7  24. b7a6 [%c_effect a6;square;a6;type;Mistake;persistent;true] Missing a forced win. 24... d8a8  25. d1d2 [%c_effect d2;square;d2;type;Mistake;persistent;true] Another big mistake. 25... e5h2 [%c_effect h2;square;h2;type;GreatFind;persistent;true] 26. e2h2  26... d6h2  27. d2h2 