Author: Enrique Irazoqui
Date: 23:47:25 02/19/01
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On February 19, 2001 at 20:00:21, Chessfun wrote: >On February 19, 2001 at 06:10:55, Enrique Irazoqui wrote: > >>On February 18, 2001 at 23:18:12, Uri Blass wrote: >> >>>On February 18, 2001 at 01:22:38, Tanya Deborah wrote: >>> >>>> >>>> >>>> >>>>Hi to all, >>>> >>>>This is a beautiful game by the Great Master Leonid Stein. >>>>I am interested to know, How many programs can avoid the fatal mistake 21.Qxh1? >>>> >>>>Deep Fritz can avoid that!!!, Deep Fritz can see that Qxb3 is better than Qxh1. >>>> Junior6 and Hiarcs7.32 and Fritz6 can´t avoid that... >>>> >>>>The position is very interesting, in this kind of position you can see some >>>>computer weak points, (the machines sometimes have so much appetite, and can´t >>>>see the great atack by White after move 21. >>>> >>>>Another question? Which program can find 12.Qb3! ???? (with a winning endgame) >>>>- because after change Queens, White is much better. I think there are no >>>>program that can find this move. >>> >>>I think that you are wrong and there are programs that can find 12.Qb3 in less >>>than an hour on fast hardware(I guess that Junior is one of them because >>>Junior5.9 on p200 can find 12.Qb3 in less than 4 hours with 0.00 evaluation) >> >>I didn't try Junior yet, but on a dual P933 with 512 MB hash, Deep Fritz plays >>12.Qb3 after 49 minutes. A beta I have of another "Deep" program takes 92 >>minutes to pick 12.Qb3. > >Hi Enrique, > This other "Deep" program does it run on a single cpu? what speed >differences do you get?. > >Thanks. >Sarah. Hi Sarah, Deep Shredder runs on a single processor machine too. When I run test positions with Deep Fritz and Crafty, I get a 1.7x speedup average with 2 CPUs compared to a single CPU, and a few times they are faster with one processor than with two. Deep Shredder is a different animal in this regard, since the speedup is only obvious in terms of N/S. Maybe Stefan cares to comment about it. Enrique
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