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Up Topic Rybka Support & Discussion / Rybka Discussion / GM Ehlvest - Rybka. Game 6 (draw)
- - By Victor Zakharov (*****) [ru] Date 2007-07-08 17:23
[Event ""]
[Site "chessplanet.ru"]
[Date "2007.7.8"]
[Round ""]
[White "GM Ehlvest"]
[Black "Rybka"]
[Result "1/2-1/2"]
[Eco "B01"]
[Annotator ""]
[Source ""]

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 ( 3...Qd6 {... Game 4: 0-1} ) 4.Rb1
e6 5.Nf3 Nf6 6.d4 c5 7.dxc5 Bxc5 8.Bd3 O-O 9.O-O Nc6 10.Bf4 a6
11.Nd2 Qd8 12.Nde4 Nxe4 13.Nxe4 Be7 14.Qh5 f5 15.Ng5 h6 16.Nf3
Qe8 17.Qxe8 Rxe8 18.Rfe1 g5 19.Bd2 Rd8 20.Bc3 Kf7 21.a4 Bf6 22.h3
Bxc3 23.bxc3 Rd5 24.g4 Rc5 25.c4 Kf8 26.Nd2 Re5 27.Rxe5 Nxe5
28.c5 fxg4 29.hxg4 Nxg4 30.Nc4 Nf6 31.a5 Nd7 32.Nb6 Nxb6 33.Rxb6
h5 34.Kh2 Bd7 35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 Kd8 38.Rxg5 Ke7 39.Rxh5
Rg8 40.Bf1 Rf8 41.Kg1 Rg8+ 42.Kh2 Rf8 43.Kg1 Rg8+ 44.Kh2 1/2-1/2
Parent - - By diskamyl (**) [tr] Date 2007-07-08 20:58
(congratulations to Ehlvest. except game 4, he played very well, I really respect his strong opposition against rybka.)

isn't 40.Bxa6 winning for white?
Parent - - By lkaufman (*****) Date 2007-07-08 21:56
It does win a pawn, but there is little doubt that the result should be a draw. In view of his time shortage and the strength of the opponent, Ehlvest felt it was not wise to press for a win that was probably not there anyway.
Parent - - By George Tsavdaris (****) Date 2007-07-08 22:01
What about the 2 "odd" moves(Bd7 and Kd8) Rybka made?
Any explanation? Was the contempt factor responsible or anything else?
Parent - - By lkaufman (*****) Date 2007-07-08 22:09 Edited 2007-07-09 04:35
     We concluded after the game, analysing with Ehlvest and Rybka, that Bd7 was actually the best move. Black was in some trouble, and waiting would have led to increasing difficulties. It should get an exclamation point. I don't think Kd8 was wrong either. The only two Rybka moves Ehlvest felt were wrong in this game were ...a6 in the opening and the exchange of bishops on c3. It's a matter of judgement; the grandmaster feels that the pressure of the rook on the newly-opened b file against the weak "b" pawn means more than the ruining of White's pawn structure. I agree, but Rybka does not. This is a matter of fine-tuning.
Parent - By George Tsavdaris (****) Date 2007-07-08 22:30

>We concluded after the game, analysing with Ehlvest and Rybka, that Bd7 was actually the best move. Black was in some trouble, and waiting >would have led to increasing difficulties. It should get an exclamation point.


Really? That comes as a surprise for me!
I don't agree with what you say here that Bd7 was the best move, but you are GMs and know much better.
I will analyze this and see if engines after playing on big depths agree with you....
Parent - By Roland Rösler (****) [de] Date 2007-07-09 02:35
Bd7 was a surprise for me. This move was not on my display and not engine like. I was sure that Jaan will choke Rybka. Best move from Rybka in the last game!
Parent - By Vasik Rajlich (Silver) [hu] Date 2007-07-11 10:52
For what it's worth, below is Rybka 2.3.2a analysis of the position after white's and black's 34th moves. 34. .. Bd7 and 34. .. Ke7 are very close and it will come down to search luck which one is played.

Vas

34.Kh2

Params = default except namilov usage = never

New game - Rybka 2.3.2a mp, Blitz:45'+15"
r1b2k2/1p6/pR2p3/P1P3pp/8/3B4/2P2P1K/8 b - - 0 1


Analysis by Rybka 2.3.2a mp :

34...Ke7 35.Kg2 Kf6 36.Kg3 Ra7 37.f4 Ra8 38.Be4 Ra7 39.Bf3 Kf5 40.fxg5 Kxg5 41.Rb4
  =  (0.00)   Depth: 16   00:00:00  109kN
34...Ke7 35.Kg2 Kf6 36.Kg3 Ra7 37.f4 Ra8 38.Be4 Ra7 39.Bf3 Kf5 40.fxg5 Kxg5 41.Rb4
  =  (0.00)   Depth: 17   00:00:00  282kN
34...Ke7 35.Kg2 Kf6 36.Kg3 Ra7 37.f4 Ra8 38.Be4 Ra7 39.Bf3 Kf5 40.fxg5 Kxg5 41.Rb4
  =  (0.00)   Depth: 18   00:00:01  631kN
34...Ke7 35.Kg2 Kf6 36.Kg3 Ke5 37.Rd6 Kf6 38.Rb6 Ke5 39.Rd6 Kf6 40.Rb6 Ke5 41.Rd6
  =  (0.00)   Depth: 19   00:00:05  1905kN
34...Ke7 35.Kg2 Kf6 36.Kg3 Ke5 37.Rd6 Kf6 38.Rb6 Ke5 39.Rd6 Kf6 40.Rb6 Ke5 41.Rd6
  =  (0.00)   Depth: 20   00:00:06  2504kN
34...Ke7 35.Kg2 Kf6 36.Kg3 Ke5 37.Rd6 Kf6 38.Rb6 Ke5 39.Rd6 Kf6 40.Rb6 Ke5 41.Rd6
  =  (0.00)   Depth: 21   00:00:12  4594kN
34...Ke7 35.Kg2 Kf6 36.Kg3 Ke5 37.Rd6 Kf6 38.Be4 Rb8 39.Rb6 Ra8 40.Rd6 Rb8 41.Rb6
  =  (0.04)   Depth: 22   00:00:35  12905kN
34...Ke7 35.Be4 Kf6 36.Rd6 Ke5 37.Bf3 h4 38.Rd8 Rb8 39.c6 bxc6 40.Bxc6 Rb2 41.Rxc8
  +/=  (0.33)   Depth: 23   00:01:18  28314kN
34...Ke7 35.Be4 Kf6 36.Rd6 h4 37.Rd8 Rb8 38.f3 Kf7 39.Kh3 Ra8 40.Rh8 Kg7 41.Rh7+
  +/=  (0.33)   Depth: 24   00:02:20  53200kN
34...Ke7 35.Be4 Kf6 36.Rd6 h4 37.Rd8 Rb8 38.f3 Kf7 39.Kh3 Ra8 40.Rh8 Kg7 41.Rh7+
  +/=  (0.33)   Depth: 25   00:02:52  63861kN
34...Ke7 35.Be4 Kf6 36.Rd6 h4 37.Rd8 Rb8 38.f3 Kf7 39.Kh3 Ra8 40.Rh8 Kg7 41.Rh7+
  +/=  (0.38)   Depth: 26   00:05:10  119mN
34...Ke7 35.Be4 Kf6 36.Rd6 h4 37.Rd8 Rb8 38.f3 Kf7 39.Kh3 Kf6 40.Rg8 Ke5 41.Bd3
  +/=  (0.38)   Depth: 27   00:08:34  186mN
34...Ke7 35.Be4 Kf6 36.Rd6 Ke7 37.Kg3 h4+ 38.Kg4 Bd7 39.Bxb7 Rb8 40.Rb6 e5+ 41.Kxg5
  =  (0.21)   Depth: 28   00:15:28  358mN
34...Ke7 35.Be4 Kf6 36.Kg3 Ke5 37.Rb4 Kf6 38.c3 Ra7 39.Rb6 Ra8 40.Rd6 Rb8 41.Rd8
  +/=  (0.34)   Depth: 29   00:21:48  492mN
34...Ke7 35.Be4 Kf6 36.Kg3 Ke5 37.Rb4 Kf6 38.c3 Ra7 39.Rb6 Ra8 40.Rd6 Rb8 41.Rd8
  +/=  (0.34)   Depth: 30   00:34:03  760mN
34...Ke7 35.Be4 Kf6 36.Kg3 Ke5 37.Rb4 Kf6 38.c3 Ra7 39.Rb6 Ra8 40.Rb4 Ra7 41.Rb6
  +/=  (0.34)   Depth: 31   01:03:16  1458mN

(Osborne, Indianapolis 08.07.2007)

34.Kh2 Bd7

Params = default except namilov usage = never

6: Ehlvest,J - Rybka 2.3.2a mp, Blitz:45'+15"
r4k2/1p1b4/pR2p3/P1P3pp/8/3B4/2P2P1K/8 w - - 0 1


Analysis by Rybka 2.3.2a mp :

35.Rxb7 Ke8 36.Bg6+ Kd8 37.Bxh5 Rc8 38.Rb6 Rxc5 39.Rxa6 Rxc2 40.Kg3 Kc7 41.Bf3
  +/=  (0.28)   Depth: 10   00:00:00  23kN
35.Rxb7 Ke8 36.Bg6+ Kd8 37.Bxh5 Rc8 38.Rb6 Rxc5 39.Rxa6 Rxc2 40.Kg3 Kc7 41.Bf3
  +/=  (0.28)   Depth: 11   00:00:00  37kN
35.Rxb7 Ke8 36.Bg6+ Kd8 37.Bxh5 Rc8 38.Rb6 Rxc5 39.Rxa6 Rxc2 40.Kg3 Kc7 41.Bf3
  +/=  (0.28)   Depth: 12   00:00:00  51kN
35.Rxb7 Ke8 36.Bg6+ Kd8 37.Bxh5 Rc8 38.Rb6 Rxc5 39.Rxa6 Rxc2 40.Kg3 Kc7 41.Bf3
  +/=  (0.28)   Depth: 13   00:00:00  86kN
35.Rxb7 Ke8 36.Bg6+ Kd8 37.Bxh5 Rc8 38.Rb6 Rxc5 39.Rxa6 Rxc2 40.Kg3 Kc7 41.Bf3 Ra2
  +/=  (0.31)   Depth: 14   00:00:00  167kN
35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 Kd8 38.Rxg5 Be8 39.Kg3 Ke7 40.Kh4 Bf7 41.f4
  +/=  (0.39)   Depth: 15   00:00:01  449kN
35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 Kd8 38.Rxg5 Be8 39.Kg3 Ke7 40.Kh4 Bf7 41.f4 Kd6
  +/=  (0.44)   Depth: 16   00:00:01  584kN
35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 Kd8 38.Rxg5 Be8 39.Kg3 Ke7 40.Kh4 Bf7 41.f4 Kd6
  +/=  (0.41)   Depth: 17   00:00:02  841kN
35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 Kd8 38.Rxg5 Be8 39.Kg3 Ke7 40.f4 Kf6 41.Kh4 Ra7
  +/=  (0.47)   Depth: 18   00:00:03  1414kN
35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 Kd8 38.Rxg5 Be8 39.Kg3 Ke7 40.f4 Kf6 41.Kh4 Ra7
  +/=  (0.45)   Depth: 19   00:00:05  2023kN
35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 Kd8 38.Rxg5 Be8 39.Kg3 Ke7 40.f4 Kf6 41.Kh4 Ra7
  +/=  (0.45)   Depth: 20   00:00:07  3133kN
35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 g4 38.Rh7 Kf8 39.Rxh5 Ke7 40.Kg3 Bf3 41.Rh6 Kd6
  +/=  (0.33)   Depth: 21   00:00:15  6937kN
35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 g4 38.Rh7 Kf8 39.Rxh5 Ke7 40.Kg3 Bf3 41.Rh6 Kd6
  +/=  (0.36)   Depth: 22   00:00:23  10342kN
35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 g4 38.Rh7 Kf8 39.Rxh5 Ke7 40.Kg3 Bf3 41.Kf4 Kd6
  +/=  (0.36)   Depth: 23   00:00:33  15312kN
35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 g4 38.Rh7 Kf8 39.Rxh5 Ke7 40.Kg3 Bf3 41.Kf4 Kd6
  +/=  (0.43)   Depth: 24   00:00:57  24766kN
35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 h4 38.Kh3 Bd5 39.Rxg5 Ke7 40.Kxh4 Rf8 41.Bxa6 Ra8
  +/=  (0.48)   Depth: 25   00:02:12  55217kN
35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 h4 38.Kh3 Bd5 39.Rxg5 Ke7 40.Kxh4 Rf8 41.Bxa6 Ra8
  +/=  (0.48)   Depth: 26   00:03:17  84203kN
35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 Kf8 38.Rxg5 Be8 39.Kg3 Ke7 40.Re5 Bf7 41.f4 Rg8+
  +/=  (0.47)   Depth: 27   00:08:48  213mN
35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 Kf8 38.Rxg5 Be8 39.Kg3 Ke7 40.Re5 Bf7 41.f4 Rg8+
  +/=  (0.43)   Depth: 28   00:12:23  318mN
35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 Kf8 38.Rxg5 Be8 39.Kg3 Ke7 40.Re5 Bf7 41.f4 Rg8+
  +/=  (0.43)   Depth: 29   00:17:42  468mN
35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 Kf8 38.Rxg5 Be8 39.Kg3 Ke7 40.Re5 Bf7 41.f4 Rg8+
  +/=  (0.43)   Depth: 30   00:28:14  751mN
35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 Kf8 38.Rxg5 Be8 39.Kg3 Ke7 40.Re5 Bf7 41.Kh4 Kd6
  +/=  (0.41)   Depth: 31   00:51:47  1402mN
35.Rxb7 Ke8 36.c6 Bxc6 37.Rg7 Kf8 38.Rxg5 Be8 39.Kg3 Ke7 40.Re5 Bf7 41.Kh4 Kd6
  +/=  (0.41)   Depth: 32   01:27:18  2382mN

(Osborne, Indianapolis 10.07.2007)
Up Topic Rybka Support & Discussion / Rybka Discussion / GM Ehlvest - Rybka. Game 6 (draw)

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