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Oswestry Chess Club
[Event "Oswestry A v Telepost A"] [Site "Oswestry"] [Date "2024.09.19"] [Round "Brd 5"] [White "Pileggi, Cesar"] [Black "Slegg, Gary"] [Result "0-1"] [ECO "A29"] [WhiteElo "1451"] [BlackElo "1575"] [Annotator "Gary Slegg"] [PlyCount "80"] [GameId "2091998211944438"] [EventDate "2024.?Board ??"] {[%evp 0,80,25,-10,-14,-36,-29,-26,-20,-17,-19,-17,-15,-13,-11,-15,20,14,11,4,4,0,19,3,6,3,-8,-18,-5,-26,-29,-89,-88,-96,-99,-227,-50,-60,-60,-79,-71,-61,-56,-62,-56,-67,-72,-157,-170,-166,-59,-98,-65,-102,-79,-83,-78,-150,-148,-179,-188,-193,-192,-190,-197,-197,-163,-256,-347,-347,-391,-740,-258,-476,-309,-612,-926,-1001,-1014,-1119,-1006,-1298,-1391] A29: English Opening: Four Knights Variation with 4 g3} 1. c4 e5 2. g3 Bc5 3. Bg2 Nf6 4. Nc3 O-O 5. Nf3 d6 6. O-O Nc6 7. e3 Bf5 (7... Bg4 {main; holdsup d4-vk}) 8. d4 (8. b3 Qd7 9. d4 exd4 10. Nxd4 Bh3 11. Bb2 Bxd4 12. exd4 Rae8 13. Qd3 h5 14. Rfe1 Bxg2 15. Kxg2 h4 16. Ne4 h3+ 17. Kf1 Nxe4 18. Rxe4 Nb4 19. Qe2 Rxe4 20. Qxe4 Re8 21. Qf3 d5 22. Bc3 Nc6 {Tari,A (2584)-Wojtaszek,R (2749) Doha 2016 0-1 (36)}) 8... exd4 {[%eval 61,22]} (8... Bb6 $1 $11 {[%eval 11,21]}) (8... Bb4 9. Bd2 e4 10. Nh4 Bg4 11. Qb3 Qe7 12. d5 Bxc3 13. Bxc3 Ne5 14. h3 Bh5 15. Bxe5 Qxe5 16. Qc2 Rfe8 17. Bh1 b5 18. Rfc1 Qe7 19. cxb5 Rac8 20. a4 Qd7 21. Kh2 Nxd5 22. Bxe4 Nf6 23. Bc6 {Franco Perez,W (1597)-Sepulveda,J Ocana 2019 0-1 (32)}) 9. exd4 $14 Bb6 {White is slightly better.} 10. Bg5 $146 {[%eval 22,23]} (10. a3 $14 {[%eval 65,20]}) (10. d5 Ne7 11. Bg5 Ng6 12. Nd4 Bxd4 13. Qxd4 Ne5 14. Rfe1 h6 15. f4 Ned7 16. Bh4 Re8 17. h3 Rxe1+ 18. Rxe1 Qf8 19. g4 Bh7 20. g5 hxg5 21. fxg5 Ne8 22. Bg3 Nb6 23. b3 Bf5 24. Qf4 g6 {Koivumaki,M (1807)-Lehmann,N (1467) Bad Homburg 2017 ½-½}) (10. Re1 Re8 11. Rxe8+ Qxe8 12. Bf4 Rb8 13. Rc1 Bg4 14. Nb5 Ne7 15. h3 Bd7 16. a4 a6 17. c5 dxc5 18. Nxc7 Bxc7 19. Bxc7 Rc8 20. Rxc5 Bxa4 21. Qe1 Bc6 22. Bd6 Ned5 23. Qxe8+ Rxe8 24. Ne5 Rd8 {Nicolau,D-Carvalho,J Americana 1991 0-1 (60)}) (10. Be3 Nb4 11. a3 Nc2 12. Rc1 Nxe3 13. fxe3 c5 14. b4 cxd4 15. Nxd4 Bg4 16. Qb3 Nh5 17. Ne4 g6 18. c5 Bc7 19. Rc2 d5 20. Nc3 Qg5 21. Nxd5 Rad8 22. Nxc7 Qf6 23. Rxf6 Nxf6 24. Bh3 Bxh3 {Mueller,D (841)-Saar,C Saarlouis Steinrausch 2005 1-0 (51)}) 10... h6 $11 11. Bxf6 Qxf6 12. Nd5 Qd8 13. b4 {[%eval -1,21]} (13. Re1 $14 {[%eval 34,23]}) 13... Be4 14. Nxb6 axb6 15. Qd2 {[%eval -118,21] [#]} (15. b5 $11 {[%eval -7,22]} Na5 16. Rc1) 15... Qf6 $1 $17 16. Qe3 Rfe8 {Black is much more active. The white rooks are badly placed.} 17. Rfd1 $2 {[%eval -330,23]} (17. a3 $17 {[%eval -102,24] is a better defense.}) 17... Bxf3 $2 {[%eval -95,23]} (17... Nxb4 $19 {[%eval -330,23] aiming for ...Nc2.} 18. Qc3 Nc2) 18. Qxf3 Qxf3 ({Weaker is} 18... Nxb4 19. Qxf6 gxf6 20. Bxb7 Rxa2 21. Rxa2 Nxa2 22. Kf1 $11) 19. Bxf3 Nxb4 20. Bxb7 {White is now going downhill.} (20. c5 $1 bxc5 21. dxc5 dxc5 22. Bxb7 Rxa2 23. Rxa2 Nxa2 24. Rd7 Nb4 25. Rxc7 Re1+ 26. Kg2 Rc1 $11 {SF17- is far more active- Wh's R is behind the advavancedpawn, and Bl must keep an eye on stopping the B getting to d5- vk}) 20... Rxa2 21. Rxa2 Nxa2 $19 {[%mdl 4096] Endgame KRB-KRN} 22. Ra1 Nb4 23. Ra8 $2 {[%eval -335,24] when behind in material one should swap pawns as in the note above , not pieces as here- vk} (23. Kf1 $17 {[%eval -116,24] might work better.}) 23... Rxa8 24. Bxa8 {KB-KN} c6 {[%eval -142,25]} (24... Nc2 $19 {[%eval -336,26] has better winning chances.} 25. f4 Nxd4) 25. Bb7 {[%eval -292,28]} (25. Kf1 $17 {[%eval -142,25] keeps fighting.- Kings need to be used actively in all endgames-vk}) 25... g6 {And now ...Kf8 would win.} 26. d5 $2 {[%eval -403,28] this puts another pawn on the same colour as the B, depriving it of mobility. It also allow Bl to obtain a passed, either immediately , or in the longer run-vk} (26. Kf1 {[%eval -196,27]}) 26... c5 {[%eval -180,27]} (26... cxd5 $142 {[%eval -403,28]} 27. cxd5 Na2) 27. Bc6 Nc2 28. Kf1 $2 {[%eval -515,25]} (28. Bb7 {[%eval -184,24] is more resistant.}) 28... Na3 29. Bb5 {[%eval -938,24]} (29. Ke2 $142 {[%eval -495,23]} Nxc4 30. Kd3 Ne5+ 31. Ke2) 29... Nxb5 30. cxb5 {with a protected passed pawn Bl's taskis straigtforward- infiltrate on the K side, sacrifice the outside pawn to draw the K away, then win with pushing a pawn through- vk} Kg7 31. Ke2 Kf6 32. f4 g5 33. Ke3 Kf5 34. fxg5 (34. Kf3 gxf4 35. gxf4 h5 {and Wh will run out of pawn moves, thus forcing the K to reteat-vk}) 34... hxg5 35. h3 Ke5 36. Kf3 Kxd5 {[%eval -1843,25] this is the simplest human move that requires far less calculation than what may be the quickest route as indicated in the Engine line that follows} (36... g4+ $142 {[%eval -32727,26]} 37. hxg4 (37. Kxg4 {requires far more calculation} Ke4 $1 (37... c4 38. Kf3 f5 39. h4 Kd4 40. Ke2 Kxd5 41. h5 Ke6 {also works}) 38. h4 c4 39. h5 c3 40. h6 c2 41. h7 c1=Q 42. h8=Q f5+ 43. Kh5 Qh1+ 44. Kg5 Qxh8 $19 {SF17 -vk}) 37... Kxd5 38. g5 Kd4 39. Ke2 c4 40. Kd2 c3+ 41. Ke2 Ke4 42. g4 Kd4 43. Ke1 Ke3 44. Kd1 Kd3 45. g6 c2+ 46. Kc1 fxg6 47. g5 d5 48. Kb2 Kd2 49. Kb3 c1=Q 50. Ka2 Qc4+ 51. Ka3 Qxb5 52. Ka2 Kc3 53. Ka3 Qb3#) 37. h4 gxh4 38. gxh4 Ke5 {[#] ( ...d5)} 39. Kg4 Kf6 {[%eval -1491,26]} (39... c4 $142 {[%eval -32729,28]} 40. Kf3 f5 41. Kf2 c3 42. Ke2 f4 43. h5 f3+ 44. Ke3 f2 45. Kxf2 c2 46. h6 c1=Q 47. h7 Qc2+ 48. Kf3 Qxh7 49. Kg3 Qe4 50. Kf2 Kf4 51. Kg1 Qe2 52. Kh1 Kf3 53. Kg1 Qg2#) 40. Kh5 c4 {Weighted Error Value: White=1.68/Black=0.91} 0-1
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Annotated by