Computer Chess Club Archives




Subject: Re: Mate in 38.

Author: Paul

Date: 19:01:39 01/25/01

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On January 25, 2001 at 21:48:06, Heiner Marxen wrote:

>On January 25, 2001 at 20:41:50, Paul wrote:

>>Thanks for checking that for me. I couldn't believe it at first!!
>>I really hope some other programmer will also try this, coz I don't use
>>proofnumber search, just 'plain' alpha-beta. Didn't know it was possible.
>Since the solution line is nearly completely forced, that does not
>look so impossible to me.  I would expect that some programs do find this one,
>depending on the nature of extensions they do.
>>Heiner, is it out of reach for Chest? What do you think?
>Yes, that is absolutely out of reach for Chest.  The problem is not to find
>the solution, but to prove all the non-solutions up to a depth of 38.
>For depth 9 Chest needs 111 seconds, and increasing the depth by one,
>multiplies the search time by 4.  Do the math and be shocked.  ;-)

Math of the 'exp'loding kind :)

I just reran it with slightly different settings (max extension of 100 ply),
and now Pretz already found the solution at 7 ply in only 23 seconds !!!
Gee wizzz ... ain't life pretty :)


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