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Subject: Re: mistakes of chess programs(chessmaster8000 and Crafty17.13)

Author: Uri Blass

Date: 15:08:17 10/03/00

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On October 03, 2000 at 17:34:59, John Merlino wrote:
<snipped>
>I'm not sure that this is "obvious", given the time control (and the fact that
>neither of us know how much time CM had on its clock). After 1.Qxe7 Bxe7 2.Bxf7
>Bxf7 3.Rd7 Rb3 4.Rxe7 Rxc3 5.Rxf7 Rc1+ 6.Be1 Rxe1+ 7.Kf2, White definitely wins
>a pawn. And, yes, it does seem obvious to me, too. But, oddly enough, the eval
>after the 15 plies necessary to calculate this is only about 0.4 higher than
>what it was at this position.

I can say that it is obvious for crafty and some other programs(Crafty17.11
likes Qxe7 from the first second).
It is certainly not obvious for chessmaster(chessmaster6000(ss=10) could not
find it after 2 hours).

I agree that you need 15 plies to calculate it without extensions but
programs usually can see it in less plies because there are many captures and
checks in this line.

Uri



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