[%c_effect b4;square;b4;type;Interesting;persistent;true] An interesting pawn sacrifice, although not necessary.
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 