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Subject: Re: A very nice positional sacrifice by Rybka

Author: John Merlino

Date: 08:49:43 01/07/06

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On January 07, 2006 at 11:16:04, Albert Silver wrote:

>In some testing against Toga in 20 min. games, Rybka played a strong maneuver,
>and temporary pawn sac that preliminary analysis suggests may have been the
>winning one.
>
>The following position arose after Toga's 36th move:
>
>[D]8/1r3q2/2p1p1k1/p1PpBppp/P1nP4/2P2PP1/4R1KP/4Q3 w - - 0 37
>
>Here Rybka played 37.h4! gxh4 (37...g4 will need to be better investigated)
>38.Kh3!! hxg3 39.Qxg3+ Kh7 40.Bf4 Qf6 (I couldn't find any real improvement over
>this BTW) 41.Qh4 Qxh4+ 42.Kxh4 Re7
>
>[D]8/4r2k/2p1p3/p1Pp1p1p/P1nP1B1K/2P2P2/4R3/8 w - - 0 43
>
>and now Rybka not only recovers the pawn, but the rook penetration is decisive.
>
>43. Kxh5 Kg7 44. Rg2+ Kf7 45. Rg6 Nb2 46. Rh6 Nxa4 47. Bd6 Ke8 48. Rh8+ Kd7 49.
>Kg6 Nxc3 50. Kf6 Re8 51. Rh7+ Kd8 52. Rb7 Kc8 53. Rc7+ Kd8 54. Rxc6 Rh8 55. Kxe6
> etc. and 1-0
>
>                                          Albert
>
>
>1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O Nc6 8. a3
>Bxc3 9. bxc3 Ne4 {[%eval 23,13] [%emt 0:00:38]}

This move, 9...Ne4, is a novelty, correct? It didn't come from the book, and
this position occurs many hundreds of times in a standard database. It seems
strange that the book would end here when there was still a lot of theory left
in the line.

For example, the CM9000 database has about 700 games that reach this position,
and five different moves are played from here, none of them being 9...Ne4.
9...dxc4 and 9...Qc7 are the most popular moves.

jm



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