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Subject: Re: Interesting king security position

Author: Ernst A. Heinz

Date: 10:00:04 05/18/98

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On May 17, 1998 at 13:34:42, Moritz Berger wrote:
>
>Here's the position in EPD format:
>
>r1bq1rk1/8/6p1/1PN2n2/p2pB2p/3Nb3/P5PP/1R1Q1R1K w - -
>
>Solution times so far (ranking according to times to play a different
>move than Bxa8, details below, all times on a P233MMX, 128MB RAM):
>
>Program / Ne5 / b6 / g4
>-----------------------------------
>1. MCP 7.1 / - / 12:27 / 03:29
>2. Fritz 5 / - / 05:39 / 24:54
>3. Hiarcs 6 / - / 10:57 / 15:44
>4. Shredder 2 / 21:47 / 01:09:48 / 01:53:44
>5. Rebel 9 / 35:54 / 51:44 / not tested
>6. CSTal Paris / - / 01:20:46 / 02:08:42
>
>I tried the position with Fritz 5 on P233MMX with 98304 KB hash tables
>
>The problem for Fritz here is move ordering on 12th ply search depth,
>which it needs to spot the trouble:

"DarkThought" also spots the trouble in iteration #12 where it resolves
26. Bxa8? as negative after roughly 1:30 min on a 600MHz Alpha-21164a.

It then locks onto 26. g4! in iteration #12 after 1:45 min.

=Ernst=



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