Partidas en base
Christian Jepson - Amador
Mondariz Open Mondariz 1994
Siciliana Najdorf B93
1. e4 c5 2. Nf3 d6 3. d4 cd4 4. Nd4 Nf6 5. Nc3 a6 6. f4 e5 7. Nf3 Nbd7 8. a4 Be7 9. Bd3 O-O 10. O-O ef4 11. Bf4 In most games the safer 11.h1 is preferred when Black may replay 11...c5, 11...e5 or even 11...h5!?. The text is very aggressive forcing Black to defend accurately. 11... Qb6 12. Kh1 Qb2 13. Nd5 $146 A new try by the swedish master Jepson. [13. Qd2 Qb6 14. Nd5 Nd5 15. ed5 Nc5 16. Ng5 Bg5 17. Bg5 f6 18. Be3 Qc7 Did not cause any particular problems to Black in Vogt-Gelfand, Halle 1987.] [13. Qe1 The main line. 13... Qb6! The latest try. (13... Qb4 The older method of defence, at presente in doubt due to the following game: 14. Rb1 Qc5 15. Nd5 Nd5 16. ed5 Bf6 17. c4 Qc7 18. Qg3 Ne5 19. Bg5! Bg5 20. Bh7! Kh7 21. Ng5 Kh6 22. Qh4 Kg6 23. Rb3! With a winning attack, Vogt-Womacka, DDR 1989) 14. Nd5 (14. Rb1? Qd8 15. e5 de5 16. Ne5 Nc5! 17. Bc4 Be6 Black has a moderate advantage Zarnicki-Dvoirys, Biel (izt) 1993) 14... Nd5 15. ed5 Qd8 The first critical position for the assesment of the whole variation. Our game will transpose into it in a few more moves.] 13... Nd5 14. ed5 Qb6 This game was played two rounds after Jepson-Nedobora where White had a very miserable position after 14...b4 15.e1?. Over the board I did not like the possibility of an improvement from my opponent who had played fast thus far. [14... Qb4!? This logical move was played in the very first game with 13.d5 15. Qe1? A very weak move that allows Black to reach immediately a favourable position. (15. Bg5!? Much more dangerous. 15... Bg5? (15... Bf6! unclear position) 16. Bh7! Kh7 17. Ng5 Kg6 18. Qd3 f5 19. Ne6 White has the attack White's attack seems devastating to me.) 15... Qf4 16. Qe7 Nf6 17. Rae1 Bg4 Black has a moderate advantage Jepson-Nedobora/Mondariz op (2)/1994/] 15. Qe1 By this we now transpose into the main line of the 11.xf4 variation. White could also play 15.e2 to take advantage of the move order, but in general, the queen enjoys better perspectives on g3. 15... Qd8 We are now following Nijboer-Wojtkiewicz/Antwerpen/1993/ a very important game for this variation. 16. c4 [16. Qg3 Mentioned in informant 59 by Wojtkiewicz who now gives 16...f6. For some reason Van Wely, playing against De Firmian did not like the move and choosed instead: 16... Nc5 17. Rae1 Nd3 18. cd3 Bf5 19. Re3 Re8 20. Rfe1 Qd7 21. a5 Bf8 22. Re8 Re8 23. Re8 Qe8 24. Bd6 Bd6 25. Qd6 f6 26. Qc7 Qb5 27. d6 Qb1 28. Ng1 Qd3 Black has a moderate advantage De Firmian-Van Wely, Akureyri 1994] 16... Nc5 17. Bc2 Bg4 18. Qg3 Bf3 19. Rf3 Bh4 [19... f5?! 20. Raf1 g6 21. Bh6 Bh4 22. Qh3 Rf7 23. Bf5! With a dangerous attack, Reinderman-Dvoiris, Leeuwarden 1993] 20. Qh3 [20. Qg4!? af1 comes into serious consideration.] 20... g6 21. Bh6 $146 [21. Raf1?! Bg5! 22. Bg3 f5 23. Bf2 Nd7 24. Bd4 Bf6 Black has a moderate advantage Nijboer-Wojtkiewicz, Antwerpen 1993, 59/298] 21... Bf6 22. Raf1 Bg7 Given as in 59/298 by Wojtkiewicz but at first sight one can see that things are not so easy. White has five well positioned pieces pointing at Black's king, while the black knight, beautifuly placed on c5 is too far to 23. g4! White has the attack For the moment the immediate double rook sacrifice on f7 was losing, on some lines the pawn on g4 makes a difference.Besides White is simply threatening g5 xg7,h6+ and h3 with an eventual sacrifice on g6 in the air. There is [23. Bg7 Kg7 24. Rf7? Rf7 25. Rf7 Kf7 26. Qh7 Kf6 27. Qg6 Ke5 28. Qg3 Kd4 Black has a decisive advantage] 23... f6?! A move I rejected immediately for positional reasons, if White could play f4, g3, h4-h5 his position would be wonderful. Later I was too impressed by his attacking chances after g4-g5 and decided to stop his
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