Khanty-Mansiysk R2: oportunidades perdidas

[Event "KM FIDE GP 2015"] [Site "Khanty-Mansiysk RUS"] [Date "2015.05.15"] [Round "2"] [White "Dominguez Perez, L."] [Black "Jakovenko, D."] [Result "1-0"] [ECO "D43"] [WhiteElo "2734"] [BlackElo "2738"] [Annotator "Ramirez Alvarez,Alejandro"] [PlyCount "71"] [EventDate "2015.05.13"] 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. g3 {The lines with 5.g3 are gaining some momentum. We have many examples of top grandmasters using it in the recent past. Personally I think that the best chance for Black are the lines involving a quick dxc4, as Jakovenko played.} dxc4 6. Bg2 Nbd7 7. a4 (7. O-O { is more popular.}) 7... Bb4 8. O-O O-O 9. Qc2 Qe7 10. a5 e5 11. Rd1 a6 12. d5 Nc5 13. Be3 {Dominguez's improvement. Previously the only thing that had been tried was in a very recent game:} (13. Bg5 Bxc3 14. bxc3 Bg4 $11 { Giri-Ivanchuk, 2015.}) 13... Nb3 {The computer says this move is already forced, and the start of some strange complications.} 14. Ra4 c5 15. d6 Qe8 16. Rxb4 {This exchange sacrifice is also forced, but the position becomes crazy!} cxb4 17. Nd5 Nxd5 18. Rxd5 {There is a dual attack on e5 and on c4. The knight on b3 feels uncomfortable on the possibility of getting trapped.} Nd4 $6 { after this move White has too much for the missing material, Black will be nearly paralyzed.} (18... e4 {is the test of fire of this position, at least according to the computers. It is still hard to evaluate, for example.} 19. Nd2 $5 Nxd2 20. Qxd2 c3 $1 21. bxc3 bxc3 22. Qxc3 {and it's not clear if White has enough compensation.}) 19. Bxd4 $2 {However to me it is very strange that Dominguez took with the bishop. Why not keep the bishop pair?} (19. Nxd4 $1) 19... exd4 20. Rxd4 b3 21. Qxc4 Be6 22. Qd3 Qc6 23. Qd2 Rac8 (23... Qc2 $1 { Would have put the entire set up with Bxd4 in question.}) 24. Ne1 Qc1 25. f4 Qb1 (25... Qxd2 26. Rxd2 Rc1 27. Kf2 Ra1 28. Bxb7 Rxa5 $13) 26. Kf2 Rc2 27. Qb4 {Black hasn't made any real progress since taking on b2 is too slow...} Re8 ( 27... Rxb2 28. d7 {Threatening Qxf8 followed by promotion with mate.} Bxd7 29. Rxd7 $18) (27... Qxb2 28. Nxc2 {and now Black can't take with the pawn.} Qxc2 29. d7 Bxd7 30. Rxd7 b2 31. Be4 $18) 28. Be4 Bg4 29. Nxc2 bxc2 30. Qa4 $1 {A strong tactical detail. White attacks everything, but most importantly the rook on e8.} Kf8 31. d7 Bxd7 32. Rxd7 {since the pawn is still pinned White wins.} c1=Q (32... Rxe4 33. Qxe4 c1=Q 34. Rd8#) 33. Qa3+ $1 (33. Bxb1 Qe3+ {is just a draw... careful to the very end!}) 33... Kg8 34. Bxb1 g6 (34... Qxb1 35. Qe7 {gets promptly mated after} Rf8 36. Rd8) 35. Qb3 Qc5+ 36. e3 {White's simply up a piece and a pawn.} 1-0

[Event "KM FIDE GP 2015"] [Site "Khanty-Mansiysk RUS"] [Date "2015.05.15"] [Round "2"] [White "Tomashevsky, E."] [Black "Grischuk, A."] [Result "1/2-1/2"] [ECO "E90"] [WhiteElo "2749"] [BlackElo "2780"] [SetUp "1"] [FEN "r4bk1/3bq3/n1Rp2p1/pr1Pp3/1p2PpN1/5P2/PP1QNB2/1K5R w - - 0 32"] [PlyCount "85"] [EventDate "2015.05.13"] 32. Nxf4 $1 {The start of a very strong and deadly attack.} Bxg4 (32... exf4 33. Bd4 Bg7 34. Nh6+ Kf8 35. Qxf4+ Ke8 36. Bxg7 Qxg7 37. Qxd6 $18 {There are too many threats here and not enough resources for Black.}) 33. Nxg6 Qf6 34. Nxf8 Rxf8 35. Rg1 $1 Qxf3 36. Qg5+ $1 Kf7 37. Rxg4 {With equal material and Black's king on f7, his position is hopeless. The engines already announce forced mate.} Ke8 38. Qg6+ Qf7 39. Qxf7+ $6 {Dubious, but good enough.} (39. Qxd6 $1 {and the game is over. The threat is simply Rc8 mate, but a6 is also hanging. Black doesn't even have a check here.}) 39... Rxf7 40. Be3 $4 {But this is a very real error.} (40. Rg8+ Kd7 41. Rxa6 {And the bishop on f2 is untouchable due to the mate threat on a7.}) 40... Nc5 $2 (40... Rf1+ 41. Rc1 ( 41. Kc2 b3+ $1 42. Kc3 $1 (42. axb3 Nb4+ 43. Kc3 Nxc6 $19) 42... bxa2 43. Rxa6 $1 {And there is a miracle perpetual.}) 41... Rxc1+ 42. Kxc1 $11) 41. Rg8+ Kd7 42. Ra8 Rb7 43. Bxc5 dxc5 44. Rxc5 $2 (44. b3 {was a little paradoxical as it weakens the 2nd rank, but it was the way to win. Black's pawns fall like flies. }) 44... Rf1+ 45. Rc1 Rxc1+ 46. Kxc1 b3 $1 {An important resource, and Grischuk eventually held the endgame.} 47. a3 Rc7+ 48. Kd2 Rc2+ 49. Kd3 Rxb2 50. Rxa5 Rh2 51. Rb5 Rh3+ 52. Kd2 Kd6 53. a4 Rh2+ 54. Kc3 Rh3+ 55. Kd2 Rh2+ 56. Kc3 Rh3+ 57. Kc4 Re3 58. Rb6+ Kc7 59. Rxb3 Rxe4+ 60. Kc5 Rxa4 61. d6+ Kd7 62. Rb7+ Ke6 63. Re7+ Kf5 64. d7 Rd4 65. Kc6 e4 66. Re8 Kf4 67. d8=Q Rxd8 68. Rxd8 e3 69. Kd5 e2 70. Re8 Kf3 71. Kd4 Kf2 72. Kd3 e1=Q 73. Rxe1 Kxe1 74. Kd4 1/2-1/2