Author: Robert Hyatt
Date: 09:40:41 05/17/98
Go up one level in this thread
On May 17, 1998 at 05:55:23, Dirk Frickenschmidt wrote:
>In CBM 63, in the 'Fritz forum', I found a nice game illustrating king
>security problems.
>
>Fritz5,P (2500) - Golubev,M (2520) [E98]
>Sparkassen Open rapid (7), 1998
>
>1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0 Nc6 8.d5 Ne7
>9.Ne1 c5 10.dxc6 bxc6 11.b4 d5 12.Bg5 d4 13.Bxf6 Bxf6 14.Na4 Bg7 15.Nc5
>h5 16.f4 exf4 17.Ned3 h4 18.Rxf4 a5 19.b5 cxb5 20.cxb5 a4 21.Rb1 Bh6
>22.Rf1 Be3+ 23.Kh1 f5 24.Bf3 fxe4 25.Bxe4 Nf5
>
>The critical position.
>On rapid chess level Fritz5 did not see the danger for white fast enough
>and lost the game.
>
>I had a look at this position on a Pentium 200MMX/48MbHash.
>
>*Fritz5* needs about 7 minutes to 'smell' the danger of being mated and
>switches to 26. b6
>This looks sufficient to me to keep a decisive advantage.
>Black seems to find no hole to cause big white problems.
>
>After more than 14 minutes Fritz5 preferred 26.g4! forcing black to put
>the cards on the table immediately. The black mate attack does not work
>in this case, and there are no tactical chances left to him this way:
>26.g4 Ng3+ (26...hxg3 27.Bxa8 Qh4 28.Rb2 Bf2 29.Rbxf2 gxf2 30.Rxf2 Ng3+
>31.Kg1 Rxf2 32.Nxf2) 27.hxg3 hxg3 28.Rxf8+ Qxf8 29.Kg2 [Fritz, checked
>by Schulz,A]
>
>*Junior 4.6* (same configuration) smelled the mating dangers even faster
>in this case:
>After 2'30 it saw big problems for white taking on a8, after 3'20 it
>switched to b6.
>It did not switch to g4 or anything else within 15 minutes.
>
>The Fritz5 rapid game ended this way:
>26.Bxa8 Ng3+ 27.hxg3 hxg3 28.Rxf8+ Qxf8 29.Bd5+ Kh8 30.Qh5+ [30.Bf3 Qh6+
>31.Bh5 Qg5 and mate in 4 (Schulz,A)] 0-1
>
>
>The whole thing is a nice example concerning king safety issues.
>Maybe I will post some more results from other programs concerning this
>position.
>
>In the meantime all of you who like testing could post the results *you*
>get.
>
>How do all the other programs manage to handle these positions?
>
>
>Kind regards from Dirk
Here's what happens on a program that "grew up on ICC" and which sees
this sort of attack *every day*. Note that I don't say that this is
right
or wrong, but in this case, Crafty certainly uses positional judgement
to
avoid a messy situation:
1 0.02 1.99 17. Nxe5
1-> 0.02 1.99 17. Nxe5
2 0.03 1.70 17. Nxe5 Qa5+ 18. Ke2
2-> 0.03 1.70 17. Nxe5 Qa5+ 18. Ke2
3 0.03 1.80 17. Nxe5 O-O 18. Nxa4
3-> 0.04 1.80 17. Nxe5 O-O 18. Nxa4
4 0.07 1.69 17. Nxe5 Bf4 18. Nc6 Nxc6 19. bxc6
4-> 0.07 1.69 17. Nxe5 Bf4 18. Nc6 Nxc6 19. bxc6
5 0.15 1.51 17. Nxe5 Bf8 18. Ncd3 Qa5+ 19. Ke2
Bg4+ 20. Nf3
5-> 0.21 1.51 17. Nxe5 Bf8 18. Ncd3 Qa5+ 19. Ke2
Bg4+ 20. Nf3
6 0.35 1.26 17. Nxe5 Bf8 18. Ncd3 Qa5+ 19. Ke2
Bg4+ 20. Nxg4 hxg4
6-> 0.62 1.26 17. Nxe5 Bf8 18. Ncd3 Qa5+ 19. Ke2
Bg4+ 20. Nxg4 hxg4
7 1.32 1.35 17. Nxe5 Qa5+ 18. Ke2 Qc3 19. Nxa4
Qa3 20. Qc2 O-O
7-> 1.90 1.35 17. Nxe5 Qa5+ 18. Ke2 Qc3 19. Nxa4
Qa3 20. Qc2 O-O
8 2.02 -- 17. Nxe5
8 2.82 0.53 17. Nxe5 Qa5+ 18. Ke2 Qc3 19. Ncd3
Be6 20. Rb2 O-O 21. b6
8 5.98 ++ 17. b6!!
8 7.55 0.92 17. b6 Bg4 18. Bb5+ Kf8 19. Nxa4 Nd7
20. b7 Rb8 21. Bxd7 Bxf3 22. Qxf3
Qxd7
8-> 9.14 0.92 17. b6 Bg4 18. Bb5+ Kf8 19. Nxa4 Nd7
20. b7 Rb8 21. Bxd7 Bxf3 22. Qxf3
Qxd7
9 13.69 1.05 17. b6 Bg4 18. Bb5+ Kf8 19. Bxa4 Qd6
20. Nd3 Bxf3 21. gxf3 Qe6 22. a3
9-> 17.25 1.05 17. b6 Bg4 18. Bb5+ Kf8 19. Bxa4 Qd6
20. Nd3 Bxf3 21. gxf3 Qe6 22. a3
10 29.46 0.93 17. b6 Bg4 18. Bb5+ Kf8 19. Bxa4 d3
20. O-O d2 21. a3 Bxf3 22. Qxf3 Qxh4
10-> 37.82 0.93 17. b6 Bg4 18. Bb5+ Kf8 19. Bxa4 d3
20. O-O d2 21. a3 Bxf3 22. Qxf3 Qxh4
~
I stopped it at this point as crafty started playing a game
on ICC and I didn't want to interfere...
Bob
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