Author: Christophe Theron
Date: 21:37:12 01/13/01
Go up one level in this thread
On January 14, 2001 at 00:22:17, Robert Hyatt wrote:
>On January 14, 2001 at 00:05:08, Christophe Theron wrote:
>
>>On January 13, 2001 at 17:19:19, Robert Hyatt wrote:
>>
>>>On January 13, 2001 at 17:13:13, Gian-Carlo Pascutto wrote:
>>>
>>>>Hi all,
>>>>
>>>>I just added code to my program to handle fractional extensions
>>>>and recapture extensions.
>>>>
>>>>My problem now is: how do I test & tune these? I did what I
>>>>normally do and ran it through WAC. It did worse. Probably not
>>>>so surprising as they are nearly all rather simple tactical
>>>>positions, so extending more (on checks...not so much on
>>>>recaptures) is nearly always a win.
>>>>
>>>>Does anybody here have a testcase? Maybe a set of positions
>>>>where it _really_ matters how you do your extensions?
>>>>
>>>>If you added frac. extensions you your program, what made you
>>>>decide to do so?
>>>>
>>>>--
>>>>GCP
>>>
>>>
>>>Do as I did. Make the extension amount something you can set via command.
>>>Then run a potload of tests. I ran WAC with all the extensions set to
>>>values between .5 and 1.0, in increments of .25. That is 3 cases for
>>>each extension and I varied 4 different extensions. 81 tests and you then
>>>look at which ones needed the fewest total nodes to solve _all_ the test
>>>positions...
>>
>>
>>
>>
>>So Crafty is cooked for WAC!? ;)
>>
>>
>>
>> Christophe
>
>
>:)
>
>actually not, as I used a lot of other positions as well (IE I used some of
>the "crafty goes deep" positions that were not tactical at all....)
I am still using full ply extensions.
I think I should try fractional extensions. Actually I did in the past. My 16
bits version used fractional extensions (in 1/100th of ply), but I was also
doing much more extensions. I mean I had more reasons to do extensions.
As for now, I prefer to be extremely "selective" in my extensions. There are a
lot of conditions to meet before Tiger triggers an extension.
Christophe
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