Author: Willie Wood
Date: 22:40:22 01/07/98
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On January 07, 1998 at 22:55:57, Robert Hyatt wrote: >On January 07, 1998 at 14:40:27, Willie Wood wrote: > >> >>Ed, >> >>you wrote >> >> >>When I worked with the 6502 processor I hardly did any extensions as >>with the slow 4-5 Mhz this was quite dangerous. I tried more extensions >>in the Milano program which should have been the main improvement over >>the Polgar. It didn't work. 500-600 NPS doesn't justify that. >>>> >> >>I didn't know you did those programs. Amazing what one learns... I >>wrote a 6502 chess program in 1978, and I believe the processor ran at 1 >>mhz. You must have been working with the hotrod 6502. :) >> >>btw, you might be interested to know that, on my powerbook 5300ce, which >>is a ppc 603e running at 117 mhz, Hiarcs 6 (PPC) runs at 328 nps. This >>is an average taken from an epd test suite done for the upcoming KKKup. >>This result has been verified on another 5300. But the point is, it >>plays a darned good game nonetheless, and I would venture to say the >>extensions are pretty extensive. >> >>WW > > >I think Ed was simply relating something we've all encountered. Things >that work poorly at slow speeds sometime work well at faster speed. IE >imagine a program that can only search 5 plies deep. And you find some >neat extension idea, but while it does extend in some useful cases, it >drops you to 4 plies everywhere else. Does it pay off? probably not, >because the difference between a 4 ply and a 5 ply program is much more >noticable than if this program started at 10 plies and had to drop back >to only 9... > >I tried singular extensions in 1978 and it dropped me from 5 back to 4, >and I decided (eventually) that it was no good. Hsu tried it with much >faster hardware and it worked. It even seems to work well for him at >100K nps based on the match he ran, which has convinced me to give this >another try later on... Bob, Yes, I understood Ed's point, my comment was meant to elicit some response on the incredible (non)-perfomance of Hiarcs on that platform, given it's obvious strength. WW
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