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Subject: Re: SSDF(Deep Fritz - Century 3)AMD K6-2 450, 3-1, now 18.5-6.5

Author: Ed Schröder

Date: 09:35:20 01/16/01

Go up one level in this thread


On January 16, 2001 at 09:06:45, Jari Kylmälä wrote:

>On January 16, 2001 at 06:19:40, Ed Schröder wrote:
>
>>New in Century 3 (being in auto232 mode) is that so now and then the
>>program checks itselfs by doing a 11 ply search (about 10-15 seconds)
>>from the start position. The total number of nodes is checked and if
>>they don't match (they should always match of course) the engine is
>>damaged and an error message is written in the log-file AUTO232.LOG
>>
>>Even if only ONE error would occur that is the ultimate proof the
>>autoplayer software damages Rebel playing strength as suspected since
>>years.
>>
>>The error message "engine damaged" can be found almost without exception
>>in the log-file after each autoplayer session.
>>
>
>How is this actually possible? Century or AUTO232 has a memory flaw and
>somehow AUTO232 is writing somewhere in the memory which should be
>allocated by Century? I don't have AUTO232 myself so I don't fully
>know how it's functioning or the protocol/interface it uses but this sounds
>very strange to me.

Yes it is strange. The suspect is indeed the driver writes outside its
own memory. I have asked for the source code of the driver but it is not
available anymore.

The other possibility Rebel hurts itself is very unlikely. Playing hundreds
of engine-engine games never returns the the error message.

Ed


>--
>Jari



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