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Subject: Re: A very nice positional sacrifice by Rybka

Author: Lar Mader

Date: 12:00:12 01/07/06

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Fritz 9 takes about 3 1/2 minutes to find this move on a p4 3Ghz.  From your
listing of the Rybka game, it looks like Rybka found it in 13 seconds?


New game,
8/1r3q2/2p1p1k1/p1PpBppp/P1nP4/2P2PP1/4R1KP/4Q3 w - - 0 1

Analysis by Fritz 9:

1.f4 gxf4 2.Bxf4 Rb2 3.h3 Qe7 4.Rxb2 Nxb2 5.Bd6 Qf6 6.Qa1
  ²  (0.68)   Depth: 7/24   00:00:00  117kN
1.Qc1!
  ²  (0.68)   Depth: 7/26   00:00:00  162kN
1.Qc1 g4 2.h3 gxf3+ 3.Kxf3 Kh7
  ±  (0.84)   Depth: 7/26   00:00:00  188kN
1.Qc1 g4 2.h3 Nxe5 3.Rxe5 Qf6 4.hxg4 hxg4 5.fxg4 fxg4 6.Qc2+ Kg7 7.Qe2 Qg6
8.Rxe6
  ±  (0.90)   Depth: 8/26   00:00:00  325kN
1.Qc1 Rb3 2.h3 Ra3 3.Qc2 h4 4.gxh4 gxh4 5.Kh2 Kh7
  ²  (0.68)   Depth: 9/24   00:00:01  670kN
1.Qc1 Rb3 2.f4 g4 3.Kg1 Kh7 4.Qe1 Ra3 5.Bd6 Kg8 6.Rxe6
  ²  (0.55)   Depth: 10/31   00:00:02  1592kN
1.Qc1 Rb3 2.f4 g4 3.Kg1 Kh7 4.Bd6 h4 5.gxh4 Nxd6 6.cxd6 Rb8
  ²  (0.43)   Depth: 11/33   00:00:04  3737kN
1.Qc1 Rb3 2.Bd6 g4 3.h3 Kh7 4.hxg4 hxg4 5.fxg4 fxg4 6.Kg1 Qf5 7.Qe1 Rb2 8.Rxe6
  ²  (0.38)   Depth: 12/39   00:00:11  10319kN
1.Kh1!
  ²  (0.39)   Depth: 12/39   00:00:15  14093kN
1.Kh1 Na3 2.Qd2 Rb1+ 3.Kg2 Nc4 4.Qd3 Ra1 5.f4 gxf4 6.Bxf4 Kh7 7.h3
  =  (0.14)   Depth: 13/38   00:00:36  34391kN
1.Qc1!
  =  (0.14)   Depth: 13/38   00:00:37  35307kN
1.Qc1!
  ²  (0.30)   Depth: 13/38   00:00:40  37321kN
1.Qc1 Rb3 2.Bd6 g4 3.Qe1 Rb2 4.Rxb2 Nxb2 5.Qe2 gxf3+ 6.Kxf3 Nc4 7.h3
  ²  (0.38)   Depth: 13/38   00:00:45  42037kN
1.Qc1 Rb3 2.Bd6 Ra3 3.Qe1 Kf6 4.Be5+ Nxe5 5.Rxe5 Rxa4 6.Re2 g4 7.h3 Ra3 8.Qc1
gxf3+ 9.Kxf3
  ²  (0.39)   Depth: 14/41   00:01:18  75887kN
1.Qc1 f4 2.gxf4 gxf4 3.Bxf4 Qf5 4.Bd6 Kh7 5.Kf2 Rg7 6.Bg3 h4 7.Bxh4 e5 8.Bg3 Rf7
9.f4
  =  (0.16)   Depth: 15/43   00:02:18  139510kN
1.h3!
  =  (0.16)   Depth: 15/47   00:02:47  168868kN
1.h3 Kh7 2.f4 Nxe5 3.Rxe5 gxf4 4.gxf4 Qg6+ 5.Kh2 Rg7 6.Re2 Qh6 7.Qf2 h4 8.Rb2
Rg3 9.Rb7+ Kh8 10.Ra7 Rxc3
  ²  (0.27)   Depth: 15/47   00:03:00  181470kN
1.h4!
  ²  (0.27)   Depth: 15/47   00:03:37  216928kN
1.h4 gxh4 2.gxh4 Kh7 3.Bf4 Rb2 4.Rxb2 Nxb2 5.Kh3 Nc4 6.Qg3 Nb2 7.Bc7 f4 8.Qg2
  ²  (0.38)   Depth: 15/47   00:03:54  233668kN
1.h4 gxh4 2.Bf4 Rb2 3.Rxb2 Nxb2 4.gxh4 Kh7 5.Kh3 Nc4 6.Qg3 Qg8 7.Qg5 Qxg5 8.hxg5
Kg6 9.Kh4
  ²  (0.47)   Depth: 16/45   00:06:04  358634kN
1.h4 gxh4 2.Bf4 Rb2 3.Rxb2 Nxb2 4.gxh4 Kh7 5.Kh3 Nc4 6.Qg3
  ²  (0.47)   Depth: 17/48   00:09:26  552512kN
1.h4 gxh4 2.Bf4 Rb2 3.Rxb2 Nxb2 4.gxh4 Kh7 5.Kh3 Nc4 6.Qg3 Qg7
  ²  (0.47)   Depth: 18/57   00:16:39  967058kN

(Mader,  07.01.2006)



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