D17: Slav Defence: 5 a4 Bf5: Lines with 6 Nh4 and 6 Ne5

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. Ne5 e6 Controls d5 6... Nbd7 7. Nxc4 Nb6 8. Ne3= 7. f3+/= Consolidates e4 7... c5 Black threatens to win material: c5xd4 8. e4 White threatens to win material: e4xf5 8... Bg6 Less advisable is 8... Qxd4 9. Qxd4 cxd4 10. Nb5+/- 9. Be3 cxd4 10. Qxd4 Qxd4 11. Bxd4 Nfd7 12. Nxd7 Nxd7 13. Bxc4 a6 Secures b5 14. Ke2 White loses the right to castle 14... Rg8 15. Rhd1 Rc8 16. b3 Bc5 17. a5 Ke7 Black king safety dropped 18. Na4 Bb4 A valuable piece 19. Nb6 Nxb6 20. Bxb6 An ideal square for the white bishop. 20... f6 21. Rd3 Rc6 22. h4 Rgc8 23. g4 23. Be3 Rd6+/= 23... Bc5= Black threatens to win material: Bc5xb6 24. Rad1 Bxb6 25. Rd7+ White forks: b7+e7 25... Kf8 26. axb6 Rxb6 27. R1d6 Rxd6 28. Rxd6 Rc6 28... e5!? is an interesting alternative 29. Rb6 Rc7= 29. Rxc6+/= 29. Rxe6?! Rxe6 30. Bxe6 Bf7 31. Bxf7 Kxf7= 29... bxc6 30. b4 30. Bxe6!? c5 31. h5+/= 30... e5 31. Bxa6 1/2-1/2 [Fritz 9 (10s)]