Author: Dave Gomboc
Date: 16:54:00 03/01/00
Go up one level in this thread
On March 01, 2000 at 17:19:38, Dann Corbit wrote: >On March 01, 2000 at 17:05:13, Dave Gomboc wrote: > >>On March 01, 2000 at 13:53:57, Dann Corbit wrote: >> >>>On March 01, 2000 at 10:28:56, Dave Gomboc wrote: >>>[snip] >>> >>>>Well, my computer resolved the fail high in twenty seconds or so. Odd. >>> >>>You have a multiple CPU machine (I think Bernhard does as well). I believe that >>>sometimes you will get different move orderings because of this and solve early >>>(or late). >> >>Yes. >> >>Occasionally Crafty does go on a "forever think", even on 1 cpu. I don't recall >>versions from say a year ago doing this. I'm sure Bob would do something about >>it if he knew of a good solution for it. Something somewhere must be blowing up >>somehow (as if that description helps. ;-) > >On the other hand, I am not sure it needs fixing. Look at the recent CCC >tournament where Crafty pounded the ether-bits out of all the competition, >including the best commercial programs in the world on top-notch hardware. > >The check extension explosions almost never cause crafty to make the wrong move >(that I have seen). If the timer fired and said "it's time to move now" it >seems like usually, it would make the right choice. It's just a bit puzzled >about exactly how good the choice is. > >Since "the proof of the pudding is in the eating" I'm not so sure it is a good >idea to 'fix' anything. IMO, the behaviour is terrible. It _might_ not be possible to avoid, but that doesn't make it any less terrible! :-) As soon as this happens, Crafty might as well stop searching and save its time for a future move, because it's like trying to go through a brick wall. I wrote Bob with a couple of suggestions on this, but they were pretty vague and I'm sure that he's got lots of things on the todo list already in any case. As for the ICC result... good show, but a casual 8-round tournament doesn't really mean all _that_ much. Dave
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