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Subject: Re: All time world record setting chess programmer goes to Richard Lang

Author: Uri Blass

Date: 05:14:15 10/27/03

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On October 27, 2003 at 07:17:09, Alastair Scott wrote:

>On October 27, 2003 at 01:34:31, Christophe Theron wrote:
>
>>All these records belong to Richard Lang.
>>
>>Nobody will *EVER* equal these records.
>>
>>It was a long time ago, so you may have forgotten.
>>
>>We have not forgotten.
>
>Very generous comments!
>
>A "problem" with Richard Lang is his beta test versions; never mind the release
>versions, these are sound! I've felt obliged to say "can you put some deliberate
>mistakes in so I can find _something_?" ;)

It has mistakes even in his release versions
Give the following position to Genius3 and tells me what is says

I found many years ago that it play the wrong move

[D]5bkq/r4p2/8/4R3/2pB4/4n2Q/p1p1r3/K5n1 w - - 0 1

Note that the original mistake was in case that Genius say shorter mate than the
real mate and I changed the position to concince it to play losing move instead
of winning move.

It seems that there was bug in Genius and when it searched 1.Rg5+ B(Q)g7 Qxh8+
is considered that check as mate.

I guess that its logic was something like
Bxh8 is illegal so it means that h8 is protected so it means that Kxh8 is
illegal and it is a waste of time to check it.

I did not check if other genius version except genius3 have that bug.

Uri



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