E21 Nimzo-Indian: 4.Nf3 (1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 b6 6.Bd2 Bb7 7.Be2 c5)

The fourth move by Black is of course O-O and marking it as e8g8 might be confusing to some people. The game below was played in the second round of the 28th Chess.com Tournament (1601-1800). The second round is still in progress. I am at the moment I type this on fourth place in group #18. In order for me to win the group and advance to the third round, I would need to win all my remaining four games. Because the likelihood of me winning games at Chess.com has been lower than me drawing or losing lately, I doubt that I could win all of those games. A player called Kounle (1845) leads the group with 6.5 points, fliubo (2045) is on second place with 6 points and wqrhmd is on third place with 4.5 points. Kounle, fliubo and me have a chance to win the group but if I had to guess which one of the tree will end up winning the group and advancing to the third round, I would think that fliubo has the best chance of being the winner.

[Event "28th Chess.com Tournament (1601-1800) -"] [Site "Chess.com"] [Date "2015.04.28"] [Round "?"] [White "wqrhmd"] [Black "Vierjoki, Timo"] [Result "1/2-1/2"] [ECO "E21"] [WhiteElo "1682"] [BlackElo "1902"] [Annotator "Tactical Analysis 2.10 (30s)"] [PlyCount "113"] [EventDate "2015.??.??"] 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 b6 6. Bd2 Bb7 7. Be2 c5 { E21 Nimzo-Indian: 4.Nf3} 8. O-O {LiveBook: 15 Games} d5 9. b3 $146 {-0.37/23} ( 9. cxd5 $11 {0.25/28} exd5 10. a3 Bxc3 11. Bxc3 Ne4 12. Bd3 (12. Rc1 Qe7 13. Ne5 Rd8 14. Qb3 cxd4 15. exd4 Nxc3 16. Qxc3 f6 17. Qc7 Qxc7 18. Rxc7 Ba6 19. Nd3 Re8 20. Rc2 Nc6 21. Rxc6 Rxe2 22. Nb4 Bc4 23. Rd6 Rae8 24. h3 Rxb2 25. Rd1 Ree2 26. Nxd5 Bxd5 {Olah,G (2017)-Tokovic,S (2220) Hungary 2013 0-1 (48)}) (12. Qc2 Nd7 13. Rac1 Qe7 14. Rfd1 Nxc3 15. Qxc3 Rac8 16. Qd2 Nf6 17. Bd3 Ne4 18. Bxe4 dxe4 19. Ne5 f6 20. Nc4 cxd4 21. exd4 Rfd8 22. Ne3 Rxc1 23. Rxc1 Qd7 24. h3 Ba6 25. Qc3 Bd3 26. d5 Ba6 {Owczarek,M (1493)-Jedrocha,K (1563) Borowice 2012 0-1 (51)}) 12... Ba6 13. Rc1 Bxd3 14. Qxd3 c4 15. Qe2 Nc6 16. Nd2 Nxd2 17. Qxd2 Re8 18. b3 b5 19. bxc4 bxc4 20. Rb1 Rb8 21. Qc2 Qd6 22. Qa4 f5 23. g3 Kf7 24. Rxb8 Rxb8 25. Bb4 Qc7 26. Qc2 {Kozomara,V-Lein,A Sarajevo 1968 0-1 (34)}) ( 9. dxc5 Bxc5 10. cxd5 Nxd5 11. Nxd5 Bxd5 12. Bc3 Nd7 13. Qa4 Nf6 14. Rfd1 Qe7 15. Bd3 Bxf3 16. gxf3 Nd5 17. Be5 Nxe3 18. fxe3 Bxe3+ 19. Kh1 f5 20. Bc4 Rad8 21. Qc6 Qg5 22. Rg1 {1-0 (22) Husari,S (2355)-Ragger,M (2347) Budapest 2003}) 9... Nc6 10. Rc1 {-1.24/26} (10. cxd5 $11 {0.00/28} Nxd5 11. Nxd5 Qxd5 12. Bxb4 Nxb4 13. a3) 10... cxd4 {-0.70/27} (10... dxc4 $1 $17 {-1.24/26} 11. dxc5 cxb3 12. Qxb3 Bxc5) 11. exd4 {-1.37/23} ({White should try} 11. cxd5 $1 $15 { -0.70/27} dxe3 12. Bxe3 exd5 13. Nb5) 11... dxc4 $17 12. bxc4 Nxd4 13. a3 { -2.29/27} (13. Nxd4 $17 {-1.08/27 is a better defense.} Qxd4 14. Be3) 13... Nxe2+ $19 (13... Bxa3 14. Nxd4 Qxd4 15. Nb5 $17) 14. Qxe2 Bxa3 15. Rcd1 Qc8 16. Ne5 Bc5 17. Bg5 Be7 $1 18. Qe3 Rd8 19. Rde1 Ba6 20. Qf4 Bb7 $2 {0.00/30 [#]} ({ Black should play} 20... Bxc4 $1 $19 {-1.77/24} 21. Ne4 (21. Qxc4 $2 Qxc4 22. Nxc4 Rdc8 $19) (21. Nxc4 $2 Nh5 $19) (21. Nxc4 Nh5) 21... Bxf1 22. Nxf6+ gxf6 23. Bxf6 Bxf6 24. Qxf6 Qc7 25. Kxf1 Rd5) 21. Re3 {-1.25/26} (21. Qe3 $1 $11 { 0.00/30}) 21... Qc5 $17 {aiming for ...Rd4.} 22. Nb5 a6 23. Nc3 $2 {-4.33/26} ( 23. Rg3 $17 {-1.29/29 was the crucial defense.} axb5 24. Bxf6 Bxf6 25. Qxf6) 23... Rd4 $19 24. Qg3 Rad8 25. h4 Ne4 {-2.06/33} (25... h6 $142 $1 {-4.53/22} 26. Bxf6 (26. Bxh6 Nh5) 26... Bxf6) 26. Nxe4 Rxe4 (26... Bxe4 27. Nxf7 Kxf7 28. Bxe7 $17) 27. Rxe4 Bxe4 28. Bxe7 {-2.04/27} (28. Bh6 $17 {-1.58/28} Bf8 29. Bg5 ) 28... Qxe7 29. f3 {-3.58/27} (29. Qe3 $142 {-2.27/28} Qb7 30. f3) 29... Bb7 30. Qf2 Qd6 31. Qe3 Qd4 {-1.42/32} (31... f6 $19 {-2.71/24} 32. Ng4 b5) 32. Qxd4 $17 Rxd4 {Endgame KRB-KRN} 33. Rb1 b5 {-0.34/30} ({Inferior is} 33... Rxh4 34. Rxb6 f6 35. Ng4 $16) (33... f6 $1 $17 {-1.38/29} 34. Rxb6 fxe5 35. Rxb7 Rxc4) 34. cxb5 $15 a5 {0.00/33} (34... g6 $1 $15 {-0.62/27}) 35. Kf2 {-0.77/28} (35. Nc6 $11 {0.00/33} Ra4 36. Kf2) 35... f6 36. Nc6 Ra4 {0.88/31} (36... Bxc6 $1 $15 {-0.60/32 stays ahead.} 37. bxc6 Rc4) 37. Nd8 $1 $16 Bd5 38. b6 { And now b7 would win.} Rb4 39. Rxb4 axb4 $14 {KB-KN} 40. Ke2 {Black must now prevent b7.} b3 {0.95/37} ({Better is} 40... g5 $14 {0.31/33}) 41. Kd2 Kf8 $2 { 4.61/32 [#]} (41... g5 $16 {1.06/33 is tougher.}) 42. Kc3 $18 Ke7 {24.99/29} ( 42... g5 $142 {4.25/33} 43. hxg5 fxg5) 43. b7 Bxb7 44. Nxb7 {KN-KP} b2 45. Kxb2 e5 46. Nc5 {16.95/36} (46. Kc3 $142 {50.77/36} Ke6 47. Kc4) 46... Kd6 47. Nb7+ $2 {0.00/35} ({White has to play} 47. Ne4+ $18 {13.09/31} Kd5 48. Ng3) 47... Ke6 $2 {13.02/33} (47... Ke7 $11 {0.00/35} 48. Kc3 Ke6) 48. Kc3 Kf5 49. Nd6+ Kf4 50. Kd3 Kg3 51. Ne8 {4.37/35} (51. Ke4 $142 {#36/35} Kxh4 52. Nf5+ Kg5 53. Nxg7 Kh4 54. g4 h6 55. Ne6 h5 56. gxh5 Kxh5 57. Kf5) 51... Kxg2 {#27/35} (51... Kxh4 $18 {4.37/35} 52. Ke2 (52. Nxg7 Kg3 $18) 52... Kg3) 52. Ke4 Kg3 53. h5 Kh4 54. Kf5 $2 {0.08/39} (54. Nxg7 {#22/36 mates} Kg5 55. Ne8 h6 56. Ng7 Kh4 57. Kf5 Kg3 58. Kxf6 Kf4 59. Ke6) 54... Kxh5 $11 {The position is equal.} 55. Nxg7+ Kh4 56. Kxf6 Kg3 57. Kxe5 {Accuracy: White = 46%, Black = 30%.} 1/2-1/2