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Daniel Homan
Joined: 28 Dec 2011
Posts: 109
Location: United States
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 Post subject: Re: QSearch, checks and the lack of progress... Posted: Fri Jul 27, 2012 9:58 pm |
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| Mincho Georgiev wrote: |
Hello!
I've been struggling with searching checks at qnodes for about 10 days now to determine any gain.
No joy. I've tried it with my programs as well as couple of written by others.
I had tried everything that comes in mind like:
- searching all checks after caps/proms.
- the above, including hashing in nodes that allow check search.
- different restrictive conditions - 1st qply, two qplys, 3, e.t.c., restricting by qnode counts with combination with the previous.
- I don't do it if the current position is in check - evasions search then
instead.
- Also, tried not to generate every checks, but only the discovery ones.
I'm sure I don't have any problem with the generation, because I had used my own debugging framework to determine
if there are any bugs, plus (as I said) I did it with other programs too with their own generators.
My request is if anyone have experience with elo gain related to this, please share.
Thanks! |
I had a similar experience with trying to put checks in to qsearch of EXchess... no elo improvement under a variety of conditions and a clear loss under most of them. Until I had the idea to use the king safety evaluation to set a flag for the qsearch. So if my eval determines the king might be at risk, it allows checks to be generated. That was a clear improvement, don't recall how much.. not large, I think, but measurable, which for my testing setup is ~ 10 elo. This is only done in the first ply of the qsearch.
I later discovered that there was also some benefit to doing checks if the previous move was the single reply to a check, but only in the first 3 ply of qsearch. As I recall, this one was more questionable (probably didn't rise to +10 elo), but I kept it because I liked it.
Should probably re-test both again when I get the time.
- Dan |
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| Subject |
Author |
Date/Time |
 QSearch, checks and the lack of progress... |
Mincho Georgiev |
Fri Jul 27, 2012 4:36 pm |
| Re: QSearch, checks and the lack of progress... |
Joona Kiiski |
Fri Jul 27, 2012 4:52 pm |
| Re: QSearch, checks and the lack of progress... |
Mincho Georgiev |
Fri Jul 27, 2012 6:36 pm |
| Re: QSearch, checks and the lack of progress... |
Joona Kiiski |
Fri Jul 27, 2012 8:01 pm |
| Re: QSearch, checks and the lack of progress... |
Lucas Braesch |
Sat Jul 28, 2012 1:30 am |
| Re: QSearch, checks and the lack of progress... |
Mincho Georgiev |
Sat Jul 28, 2012 6:41 am |
| Re: QSearch, checks and the lack of progress... |
Mincho Georgiev |
Sat Jul 28, 2012 9:22 am |
| Re: QSearch, checks and the lack of progress... |
Daniel Homan |
Fri Jul 27, 2012 9:58 pm |
| Re: QSearch, checks and the lack of progress... |
Lucas Braesch |
Sat Jul 28, 2012 1:37 am |
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