Author: Robert Hyatt
Date: 06:20:35 10/10/00
Go up one level in this thread
On October 10, 2000 at 09:03:49, Joshua Lee wrote:
>
>>
>>You will have to rephrase your question a bit. But to help, if you meant
>>"can crafty on the quad xeon play with Cray Blitz on the T90?" the answer
>>is _NO_. CB on the T90 runs at around 7M nodes per second, about 7X faster
>>than the quad xeon. I wouldn't want to play such a handicap match.
>>
>>On the other hand, if you mean "Can Crafty, on the best box you can get today
>>play with CB on the T90?" the answer is yes. I have some data from Tim Mann's
>>21264a machine which is about as fast as my quad xeon, but using a single cpu
>>at 667 mhz. A 16 cpu machine would be faster than Cray Blitz. And I would
>>expect it to win more than it would lose, although I think it would be pretty
>>close.
>
>Great that answers that question to recap singular extentions, King safety,
>selectiveness near the leaf positions in CB , while crafty probably has more
>positional(particularly endgame) knowledge.
>
>What do the Vectorizable algorithms do?
Chess things. IE we had a vectorized move generator, a vectorized attack
detector ("is my king in check?"), some vectorized evaluation code (IE the
king safety stuff). We also had about 20K lines of assembly language that
_really_ took advantage of the huge number of registers on the machine.
>What were the NPS of crafty in later years? I know there were several Cray
>versions but thats about it.
In the late 80's, we were doing about 200K, by the early 90's, 500K on a
C90. Finally about 7M on the T932.
>
>I think another good question is if the two were on compareable systems which
>isn't likely do to cost (if i get a multi-cpu alpha i'll let you know) would the
>two be fairly equal maybe 45% for crafty?
I am not sure. I think that if CB didn't find something tactical, then it is
likely that recent additions to crafty's eval would settle things in its favor
in the endgame...
>
>Lastly What has been the most difficult thing for you to put into crafty or CB,
>what are your plans with crafty, What can't you put into it? I ask this one
>because i know there are certain things in chess computers don't understand and
>i know that when botvinnik was working on his computer it was difficult to
>translate his ideas...
I don't know of anything I can't put in. It is all a matter of time. Crafty
is probably 50% slower than it was 3 years ago, due to added evaluation. The
hard part is preventing new stuff from breaking or conflicting with old stuff.
>
>
>Thanks again for your time i could talk your head off.
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