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Subject: Re: Can any program solve this at tournament time controls and save the draw

Author: Dieter Buerssner

Date: 19:44:25 07/31/01

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On July 31, 2001 at 21:57:27, Dann Corbit wrote:

>r1r3k1/pp3p1p/3pbp1Q/4p3/4P3/3R1N2/1PPK1PPP/q6R b - - am Qxh1 Qa5+; bm Rxc2
>Qxb2; id "Bob Kiviaho/CM8000 --> CCC July 27, 2001 at 15:59:52";

I can not answer the question in your subtject line. However, after I have
recently added some epd stuff to Yace, I am very confused about this line. I can
see am and bm. Still, a lot of other moves are possible (Yace thinks 39 moves).
So, what to do with a position, that has am and bm? I cannot think about
anything sensible. If only the bms are valid, the ams are just useless, and at
least confusing. If any other move than the ams are well, the bms don't make any
sense either.

After I have studied many postitions, I come (almost) to the cinclusion, that am
is of not much worth. I think, even a very long list of bms would make more
sense. So, if you have one move, that is clearly losing, I would find it more
appropriate, to list all legal moves besides the losing move as bm - even when
the list would get very long. I think, am can only make sense, when only this
move is losing. Having both am and bm: How should one estimate an engine, that
selects one of the am? The same for the legal moves, that are neiter am nor bm?

Regards,
Dieter




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