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Subject: Re: Interesting position solved only by Junior5 and Exchess2.45!

Author: James Robertson

Date: 08:34:20 11/13/98

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On November 13, 1998 at 01:19:29, Lawrence S. Tamarkin wrote:

>I found the following interesting positon from the game, Saglchik-Zamora USAT
>East, Parippany 1995, while studying the Chess Assistant program, 'Encyclopedia
>Of Middlegames'. (A really fantastic tutor program).
>
>3rk2r/pb1n1p1p/1q2pp2/1Bb5/1p1NP3/4B3/PP3PPP/R2Q1RK1 w k - 0 1  (16.Nxe6)
>
>
>All engines in Junior were set to 'adopt all hashtables', at the 10 minute
>level, on my Acer, 200MhZ, 32m ram machine, for what it is worth.
>
>1. Junior5 finds 16.Nxe6 after 19 seconds
>2. Fritz5 (16 bit), 16.Qd3 is executed after 25 seconds.
>3. Crafty 15.19, 16.Qd3, after 35 seconds.
>4. Exchess 2.45, 16.Nxe6 after 25 seconds.
>5. Rebel 10, 16.Qd3, after 14 second (set at 13 meg Hash tables, 10 minute game.
>6. CM6000, 16.Qd3, almost immeidately! And this from the program that finds
>   Mate in 14 in the Shirov-Krasenkov position!

If you set the time limit at 10 minutes you get this move, but if you increase
the time limit (30 minutes?) CM5500 finds 16. Nxe6 in about 30 seconds on my
P233. Hash table was the default (1 MB?) However, I had about 5 other large
time-consuming programs on at the same time (including AOL; a major memory
muncher!), so the solution time is almost certainly much shorter.

James

>
>Incidently, 'Encyclopedia Of Middlegames', gives the variation, 16.Nxe6 fxe6
>17.Bxd7+ Ke7 18.Bxc5 Qxc5 19.Qg4 Qe5(?)20.Qg7+ Kd6 21.Rfd1+ Kc7 22.Be8!, as
>winning.  But Junior5 also found the amazing variation, (after, 16.Nxe6 fxe6
>17.Bxd7+ Ke7 18.Bxc5 Qxc5 19.Qg4 Kxd7 20.Qg7+ Qe7! 21.Rfd1 Bd5!, and Black is
>alright! - I think:)
>
>Also, I found by perusing the contents of the Rebel Million Base, that the
>actual game continued this way; 16.Nxe6 fxe6 17.Bxd7 Ke7 18.Qg4 (Sagalchick
>decides against 18.Bxc5!?)...Bxe3 19.Qg7+ Kd6 20.Rad1+ Bd4 21.Rd2 Kc7 22.Be8!
>Ke8! 23.Qxh8 Bc6 24.Qxh7 Bxe8, and Black later drew.  All in all, a really
>facinating game with plenty of complications.  And only in Million Base, as far
>as I know.
>
>mrslug - the ikompetent chess software addict!



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