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Peter Svidler vs Peter Leko
4th FIDE Grand Prix (2009), Nalchik RUS, rd 9, Apr-24
Spanish Game: Closed Variations (C84)  ·  1/2-1/2

ANALYSIS [x]

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Kibitzer's Corner
Apr-25-09  gorash: <The critical moment occurred unexpectedly. Leko carelessly ignored Whites powerful e5-bishop, although he could drive it away by 26f6! And then Svidler made a mistake by not calculating 27.Bxg7+! The analysis shows that it wins: 27Kxg7 28.Qe5+! (wrong is 28.N!f5+? Kh8!) 28Kg8 (also sad are 28f6 29.Ne6+ Kg8 30.Qg3+ and 28Kg6 29.Qg3+ Kf6 30.Re4!) 29.Nf5 f6 30.Qg3+ Kh8 31.Re7! Qxe7 32.Nxe7 Nxe7 33.Qc7!, and White has a decisive material advantage.>

Shipov

Apr-25-09  AnalyzeThis: Just another example of how today's guys are overrated.
Apr-26-09  notyetagm: 27. Nf5 ?

(27. Bxg7+ {} Kxg7 28. Qe5+ Kg8 29. Nf5 f6 30. Qg3+ Kh8 31. Re7 Qxe7 32. Nxe7 Nxe7 33. Qc7 Bxg2 34. Kxg2 Re8 35. Qd6 Ng8 36. Qxa6 Re5 37. h4 Rh5 38. a4 bxa4 39. Qxc4 Ne7 40. Qf7 Ng6 41. Qxf6+ Kg8 42. Qd8+ ♖ybka Aquarium (0:02.53) +3.84|d17 White has a decisive advantage)

Apr-26-09  notyetagm: < gorash: <The critical moment occurred unexpectedly. Leko carelessly ignored Whites powerful e5-bishop, although he could drive it away by 26f6! And then Svidler made a mistake by not calculating <<<27.Bxg7+!>>> The analysis shows that it wins: 27Kxg7 28.Qe5+! (wrong is 28.N!f5+? Kh8!) 28Kg8 (also sad are 28f6 29.Ne6+ Kg8 30.Qg3+ and 28Kg6 29.Qg3+ Kf6 30.Re4!) 29.Nf5 f6 30.Qg3+ Kh8 <<<31.Re7!>>> Qxe7 32.Nxe7 Nxe7 33.Qc7!, and White has a decisive material advantage.>

Shipov>

31 ♖e1-e7! <INTERFERENCE> is what you have to see before playing 27 ♗e5xg7+! and is possibly what Svidler overlooked.

Apr-26-09  notyetagm: Game Collection: Interference/Line-closing: blocking GUARD line

Kamsky vs Leko, 2008
48 - Rf3-a3! blocks White a8-rook from defending a1-promotion square

Svidler vs Leko, 2009
31 Re1-e7! blocks Black d7-queen from defending g7-mating square

<NUNN: WHEN THERE ARE THREATS OF <<<PAWN PROMOTION>>> (Kamsky vs Leko, 2008, a1-promotion square) OR <<<MATING THREATS>>> (Svidler vs Leko, 2009, g7-mating square), THEN *ALL* OF THE TACTICS WORK *ESPECIALLY* <<<INTERFERENCE/LINE-CLOSING>>> (Leko played 48 ... ♖f3-a3!, Svidler missed 31 ♖e1-e7!).>

Apr-26-09  notyetagm: http://chessok.com/broadcast?key=na...
Apr-27-09  notyetagm: http://en.wikipedia.org/wiki/Interf...(chess)

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Featured in the Following Game Collection[what is this?]
31 Re1-e7! blocks Black d7-queen from defending g7-mating squar
from Interference/Line-closing: blocking GUARD line by notyetagm

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