Author: Robert Hyatt
Date: 21:09:27 01/29/02
Go up one level in this thread
On January 29, 2002 at 14:19:26, Uri Blass wrote: >On January 29, 2002 at 14:08:45, Robert Hyatt wrote: > >>On January 28, 2002 at 16:57:35, Joshua Lee wrote: >> >>>>>Congrats on taking the initiative. >>>>> >>>>>Can we assume that this is a DOS program and that it is related somehow to the >>>>>Russian mainframe chess program of the old days? >>>> >>>> >>>>Even less than you can assume Crafty is related to Cray Blitz. :) >>> >>>This is basically the version that was rewritten into "Turbo-C" and from the >>>documentation has refinements from the version that played in the 2nd Computer >>>Olympiad in London 1990. It is about as close as we can get to the actual >>>mainframe version from the 70's. So like Crafty is related to Cray Blitz , so is >>>this PC version of Kaissa. I would like to mention something fairly obvious but >>>yet interesting that is where Kaissa in 1972 played Komsomolskia Pravda Readers >>>it took 90 minutes in one instance to search 1,500,000 this PC version on a >>>1Ghz it searched 2,673,745 in 56 seconds. Huge increase from 200-300 Positions >>>per second i'd say. The readers played Spassky in 1971 in two games and drew one >>>and lost the other. Spassky at that time was 2690 which would put the readers >>>average at 2490. Kaissa managed the same result against the readers losing one >>>game and drawing the other which would put it's average at 2290. >> >>The problem is that the way they searched in 1974 has _nothing_ to do with the >>way they searched in 1990. Ditto for Blitz in 1977 WCCC, vs Cray Blitz in >>the 1983 WCCC event. There is simply nothing comparable between those two >>programs, even though I wrote _both_. Faster hardware completely changed the >>way the search was used... And it changed what could be evaluated as well... > >You tried to write a strong program when you wrote Cray blitz. >I believe that they did not try to write a strong program after 1974 so you >cannot know that they searched in a different way. > >Uri However I _do_ know that Kaissa 1974 was a strong program for that time period. And there were a few "brute force" programs running at the time and they all got smashed due to 3-4 ply searches max...
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