Author: Sune Larsson
Date: 15:03:53 08/18/01
Go up one level in this thread
On August 18, 2001 at 16:14:19, Dieter Buerssner wrote:
>On August 18, 2001 at 15:18:32, Sune Larsson wrote:
>
>> 8/pR4pk/1b6/2p5/N1p5/8/PP1r2PP/6K1 b - - 0 1
>>
>> Ortueta - Sanz, 1934
>
>Nice to see this position. It was sent to me by Carlos Pesce, who is also a
>regular at this forum, perhaps almost a year ago.
>
>My current developement version of Yace, AMD K6-2 475, 20M hash needs 1:45:
>
> 1497226 9.701 -0.12 9. 1...c3 2.bxc3 Rxa2 3.Nxb6 axb6 4.Rxb6 Ra3 5.Rc6
> Rxc3
> 1693487 10.698 -0.22 10t 1...c3 2.bxc3 Rxa2 3.Nxb6 axb6 4.Rxb6 Ra3 5.c4
> Rc3 6.Rc6 Rxc4 7.Kf2 Rc3H 8.g4H {HT}
> 1946017 12.217 -0.21 10t+ 1...Bd8 2.Rxa7 Bf6 3.Rb7 Bd4+ 4.Kf1 Rf2+ 5.Ke1
> Rxg2 6.Nxc5 Bxc5 7.Rb5 {270}
> 2458940 15.380 -0.11 10t 1...Bd8 2.Rxa7 Bf6 3.Rb7 Bd4+ 4.Kf1 Rf2+ 5.Ke1
> Rxg2 6.h3 Rh2 7.Rb5 g6 {10}
> 2926399 18.128 -0.11 10. 1...Bd8 2.Rxa7 Bf6 3.Rb7 Bd4+ 4.Kf1 Rf2+ 5.Ke1
> Rxg2 6.h3 Rh2 7.Rb5 g6 {10}
> 4866538 30.034 -0.10 11t 1...Bd8 2.Rxa7 Bf6 3.Rb7 Bd4+ 4.Kf1 Rf2+ 5.Ke1
> Rxg2 6.h3 Rh2 7.Rb5 Kg6 8.h4 {10}
> 6251300 38.072 -0.10 11. 1...Bd8 2.Rxa7 Bf6 3.Rb7 Bd4+ 4.Kf1 Rf2+ 5.Ke1
> Rxg2 6.h3 Rh2 7.Rb5 Kg6 8.h4 {10}
> 13214562 1:21.1 -0.09 12t 1...Bd8 2.h3 Bf6 3.Kf1 Bd4 4.g3 Rf2+ 5.Ke1 a6
> 6.Ra7 Rh2 7.Rxa6 Bxb2 8.Nxb2 Rxb2 {HT} {0}
> 17224255 1:44.6 -0.08 12t+ 1...Rxb2 2.Nxb2 c3 3.Rxb6 c4 4.Rb4 a5 5.Rxc4
> cxb2 6.Rh4+ Kg6 7.Kf2 b1=Q 8.Kf3 {421}
> 17819072 1:47.9 0.30 12++ 1...Rxb2 2.Nxb2 c3 3.Rxb6 c4 4.Rb4 a5 5.Rxc4
> cxb2 6.Rh4+ Kg6 7.Kf2 b1=Q 8.Kf3 {421}
> 20309569 2:02.6 1.56 12t 1...Rxb2 2.Nxb2 c3 3.Rxb6 c4 4.Rb4 a5 5.Nd3
> cxd3 6.Rh4+ Kg8 7.Rc4 d2 8.Rc8+ Kf7 9.Rd8 {-420}
> 20518471 2:03.9 1.56 12. 1...Rxb2 2.Nxb2 c3 3.Rxb6 c4 4.Rb4 a5 5.Nd3
> cxd3 6.Rh4+ Kg8 7.Rc4 d2 8.Rc8+ Kf7 9.Rd8 {-420}
> 27089623 2:42.1 1.89 13t 1...Rxb2 2.Nxb2 c3 3.Rxb6 c4 4.Rb4 a5 5.Rb5 c2
> 6.Kf2 c1=Q 7.Ke2 Qg1 8.Kf3 {HT} {161}
> 29913694 2:58.8 1.89 13. 1...Rxb2 2.Nxb2 c3 3.Rxb6 c4 4.Rb4 a5 5.Rb5 c2
> 6.Kf2 c1=Q 7.Ke2 Qg1 8.Kf3 {HT} {161}
>
>Some versions of Yace find it at depth 11 in about 35 seconds on my computer.
>It gave me already a lot of headache, why this is the case (after investigagint
>MB long dumps of the search tree) ...
>
>I add a snippet of the PGN, Carlos sent. I think, he won't mind:
>
>---
>{THE IMPORTANCE OF A PASSED PAWN
>This ending was played by two unknown spanish players (Ortueta-Sanz)
>but...they seemed the best!}
>
>[Event "?"]
>[Site "?"]
>[Date "?"]
>[Round "-"]
>[White "?"]
>[Black "?"]
>[Result "*"]
>[FEN "8/pR4pk/1b6/2p5/N1p5/8/PP1r2PP/6K1 b - - 0 1"]
>[SetUp "1"]
>
>{--------------
>. . . . . . . .
>p R . . . . p k
>. b . . . . . .
>. . p . . . . .
>N . p . . . . .
>. . . . . . . .
>P P . r . . P P
>. . . . . . K .
>black to play
>--------------}
>1... Rxb2 {!!} 2. Nxb2 c3 3. Rxb6 {unique! 3. Nd3? c4+ 4. Rxb6 cxd3 5. Rc6
>d2!} c4 {!! see! R and N can't detain the pawn} 4. Rb4 a5
>*
>{Now, thanks to a passed pawn, white can draw in a difficult position:
>Black threaten Qxf4 and Qb1+-Qxb4 or Qb1+-Nf1+}
>---
>
>I wonder about one thing. Carlos calls these two unknown players. How is it
>possible, that you both found this position independently?
>
>Regards,
>Dieter
Several reasons, I guess. First, the black player is not that unknown -
Jose Sanz Aguado participated in the Spanish team at the Olympics of
Prague in 1931. Then he was Spanish Champion of 1943, beating Rey Ardid
in a match with 5.5-4.5. Second, this game is well known since the finish
is quite spectacular. The whole game is to found in most bases, like f.e
Big 2001. Third, this ending is part of the interesting positions of
Valentin Albillo. You can find them here:
http://www.geocities.com/TimesSquare/6298/cmain.htm#tests
For sure this position should be put in a folder named
"Recognizing unstopable pawns", as this is the theme here.
Just a tip to Franz Morsch...;-)
Sune
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