Author: Christophe Theron
Date: 08:23:41 12/29/03
Go up one level in this thread
On December 28, 2003 at 21:07:34, Tom Likens wrote:
>On December 28, 2003 at 16:55:49, Tord Romstad wrote:
>
>>Hi Tom!
>>
>>That's precisely what I am doing in Gothmog, as you probably know. I'm glad
>>to hear that you try similar ideas, and that your first results are promising.
>>I've found that it takes lots of tuning and testing before it works well,
>>but I think such techniques have great potential in the long run. If it's
>>done right, most of the improvements you do in your evaluation function will
>>automatically improve the accuracy of your search.
>
>When I first started experimenting with this idea I was *very* aggressive.
>Interesting it didn't really hurt the programs tactics and it seemed to
>reach much deeper depths while searching, so I was very excited.
>Unfortunately, when I played the new version against the older non-pruning
>version it lost rather badly. So, now I'm starting out in a more
>conservative fashion and tuning the reductions based on actual games.
>
>>>My (obvious) question, how do other programmers deal with this phenomenon?
>>>I suppose ignoring it is one option, but I'm hoping there is a better
>>>solution.
>>
>>I agree that this problem is extremely annoying, and I have spent lots of
>>time and effort trying to find a solution. Unfortunately, I still haven't
>>found any good ideas. I asked a question about exactly this problem here in
>>CCC just a couple of days ago, but the only person who replied was Dieter
>>Bürssner, who also hadn't found a better solution than just ignoring the
>>problem and hoping it wasn't too important.
>>
>>Tord
>
>The fact that neither yourself nor Dieter have found a satisfactory solution
>illustrates the difficulty of the problem. It may be possible to tag these
>nodes when they are saved into the hash table and simply use them for move
>ordering, as Uri suggested. I need to gather some data before I can make
>any kind of intelligent decision. I do agree though that the concept has
>*massive* potential. I wouldn't be surprised if this wasn't part of the
>"secret" of the commercial programs, (especially that Tiger fella) ;-)
>
>--tom
If I understand the idea correctly, then no, Chess Tiger does not that.
Christophe
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