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Subject: Re: Shirov strong tactical test position

Author: Chris Whittington

Date: 07:41:05 09/23/97

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On September 23, 1997 at 08:49:48, Chris Whittington wrote:

 

>

>On September 23, 1997 at 06:36:27, Dirk Frickenschmidt wrote:

> 

>>Hi everybody,

>> 

>>I'm glad to return to computer chess again here after all the 

>>ad-hominem-BS in rgcc.

>

>Welcome back !

> 

>> 

>>When I got Alexej Shriov (Top 10 GM in FIDE and PCA) to playing some 

>>blitz testgames against the then new Hiarcs6-engine recentlly and we 

>>talked about strong and weak sides of the new programs he came along 

>>with one of his favourite test positions from one of his very nice 

>>games (critical move 24, german notation having D for Q [queen], T for 

>>R [rook], L for B [bishop] S for N [knight], ):

>> 

>>Shirov,A (2695) - Piket,J (2625) [D52]

>> Amsterdam Donner (6), 1995

>> [Shirov /DF]

>> 

>>1.d4 d5 2.c4 c6 3.Sc3 Sf6 4.Sf3 e6 5.Lg5 Sbd7 6.e3 Da5 7.cxd5 Sxd5

>> 8.Dd2 Lb4 9.Tc1 h6 10.Lh4 0-0 11.Ld3 Te8!? N (11...e5) 12.a3 Lxc3

>> 13.bxc3 Dxa3 14.0-0 e5 [14...Df8!?] 15.Sxe5! [15.dxe5?! Dc5 with the

>> idea 16...a5, 17...a4.] 15...Sxe5 16.dxe5 Dc5!? [16...Txe5 17.e4 Sb6

>> 18.f4 with the idea 19 f5.] 17.Kh1 Le6 [17...Txe5 18.e4 Th5?! 19.Lg3

>> Sf6 20.Tce1!] 18.e4 Sb6 19.f4 Lc4 20.Tf3! Lxd3 21.Txd3 Dc4?!

>> [21...Kh7] 22.Te1 Kh7 23.Th3 Te6? [23...Dc5 24.Lg5! A) 24...Sc4

>> 25.Dd7! Df2 26.Tg1 Kg8 27.Lxh6 gxh6 28.Dg4+ Kf8 29.Txh6+-; B) 

>>24...Df8

>> B1) 25.f5? Sc4 26.Df4 Sxe5 27.f6 Te6 28.Tf1 (28.fxg7 Dxg7 29.Lxh6 

>>Txh6

>> 30.Txh6+ Dxh6 31.Dxe5 Tg8!) 28...Tae8 29.fxg7 Dxg7 30.Lf6 Dg6 31.Tg3

>> Txf6 32.Dxf6 Dxf6 33.Txf6 a5; B2) 25.Tf1! 25...Kg8 (25...Te6 26.f5

>> Txe5 27.f6+-) 26.De2! Te6 (26...hxg5 27.Dh5 f6 28.fxg5 Txe5 29.Dh7+ 

>>Kf7

>> 30.Txf6++-) 27.f5 Txe5 28.Lf4 Ta5 29.f6 g5 30.Ld6 Dxd6 31.Txh6+-; C)

>> 24...Kg8 25.Lxh6 gxh6 26.f5! Df8 27.Txh6 Txe5 28.Th5! (28.Dg5+?! Dg7

>> 29.Dh4 Sd5!) 28...f6 29.Da2+ Sd5 (29...Df7? 30.Th8+ Kg7 31.Th7++-;

>> 29...Kg7? 30.Te3+-) 30.Te3! with the idea 30...Kf7 31.Th7+ Ke8 

>>32.Teh3

>> Txe4 (32...Sf4 33.T3h4 Td8 34.h3 Txe4 35.Th8+-) 33.Db1 Sxc3 34.Txc3 

>>Te7

>> 35.Tch3+-] 

>> 

>>24.Lf6!+- 

>> [DF 24.Lg5!! An even stronger move winning right away found out later 

>>by

>> Shirov. 

>> Hiarcs6 didn't find the move overnight. Well, Fritz 5 found the idea in 

>>acceptable analysis time!  (P133 with only 4Mb Hash after 3hours 50 

>>minutes)

>> 

>

>

>I tried this on the release version of CSTal. We have this game in 

>book, so CSTal would play Lf6 without any thought; so I turned the book 

>off, and put it into infinite mode (PP200).

> 

>It found Bf6 very fast, then after 25 seconds:

> 

>Lg5 !! Kg8 f5 Rxe5 Bxh6 g6 fxg6 +1.90, 7 ply, 25 secs.

> 

>The move was holding later with the score at +2.03 for 9 ply, and 

>+2..41 failing high at 10 ply, then +2.80 on the 10 ply research.

> 

>Do I get a beer for this ?  :)

> 



Still there after two hours, 13 ply. Only +2.60 now, thinks Rg6 is the 
best defence. The hash table is shot to hell.

 

BTW CSTal works just fine in a DOS window from Win98 (that's Windows 
ninety-EIGHT, beta version)  :-}

 





Chris

 


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