So I've been watching Agadmator for a while now, and I found this video of Grischuk vs Safarli where Grischuk makes a queen sacrifice and has positional compensation? I don't get it, and I don't understand how it works at all, can someone shed some light please?
1. Nf3 c5 2. c4 Nc6 3. Nc3 g6 4. e3 Nf6 5. d4 cxd4 6. exd4 d5 7. cxd5 Nxd5 8. Qb3 e6 9. Bb5 Bg7 10. Bxc6+ bxc6 11. O-O O-O 12. Na4 Qd6 13. Re1 Rb8 14. Qd1 Ne7 15. Bd2 Nf5 16. Bc3 Rd8 17. Nc5 Nxd4 18. Ne4 Qd5 19. Nxd4 Bxd4 20. Qa4 Qb5 21. Qxd4 Rxd4 22. Bxd4 f5 23. Nf6+ Kf7 24. Nxh7 c5 25. Bc3 Rb7 26. Re3 Re7 27. Ng5+ Ke8 28. Rae1 e5 29. Bxe5 Bb7 30. a3 Kd7 31. f3 Kc8 32. Nh3 Qa4 33. b4 c4 34. Nf2 g5 35. h3 f4 36. Rc3 Bd5 37. Ng4 Kb7 38. Kh2 Qc6 39. Rd1 Qe6 40. Bf6 Rd7 41. Bxg5 Bc6 42. Rxd7+ Bxd7 43. Bxf4 Ba4 44. Re3 Qd7 45. Be5 Bc2 46. Bc3 Ka6 47. Ne5 Qf5 48. Kg1 Kb5 49. Kf2 Qg5 50. g3 Qf5 51. Kg2 Bd3 52. h4 Ka4 53. h5 Kb3 54. Bd4 Kc2 55. h6 Qh7 56. Ng4 Kd2 57. Re6 Bf5 58. Be3+ Kd3 59. Nf2+ Kc2 60. Rc6 Kb3 61. g4 Qd7 62. Ra6 Bb1 63. Rxa7 Qe6 64. Bf4 c3 65. h7 Qf6 66. Kg3 Qh8 67. b5 Bxh7 68. b6 c2 69. b7 Ka2 70. Ra8 Qa1 71. Kg2
At the point of the sacrifice:
i) White, through the unopposed knight and bishop, gains dominance on the dark-squares - which is significant due to the dark square weaknesses around the black king (note how this immediately prompts 22...f5 by the opponent).
ii) Black has a terrible weakness on c6, which, if it falls, allows the direct creation of a far outside passer for white in many of the resulting endgames (consider the a&b-pawn v a-pawn). This is in stark contrast to white, which has no isolated pawns, and good structure (especially with regards to king safety).
iii) Black is not fully developed, the bishop will take time to get an active role in the position due to all the pawns being on the wrong colour complex (especially after it becomes tied to the defence of the backward e-pawn). Contrast with if it was already on d5, covering all the weaknesses.
iv) The sacrifice is really only an exchange (Rook v Knight), and whilst the bishop has no role, its an exchange in favour of white (Rook v Knight & Bishop).
v) Opposite coloured bishops favour the attacking side, (which feels like white at this point), and mean that many endgames will be drawn if further piece exchanges are made.
The main positional compensation is the monster dark square bishop. Black has no way to challenge it as both of his knights, d-pawn, b-pawn as well as dark square bishop are already gone. So, if needed, it will forever be there aiming black's open kingside. White king is very safe and despite black having a queen for rook and a knight, there's really no attacking ideas.
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