Search found 338 matches

by mmt
Fri Dec 25, 2020 9:17 am
Forum: Computer Chess Club: General Topics
Topic: Reset-Mobility Chess
Replies: 5
Views: 451

Re: Reset-Mobility Chess

Seems pretty similar to my suggestion from February: http://talkchess.com/forum3/viewtopic.php?f=2&t=72988. I'm for it.
by mmt
Wed Dec 16, 2020 6:23 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Recommendation for C++ Programming Forums?
Replies: 9
Views: 1150

Re: Recommendation for C++ Programming Forums?

There is nothing great. https://www.reddit.com/r/cpp/ is ok if you want to talk about the standard.
by mmt
Sun Dec 13, 2020 4:54 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Can EGTB storage requirements be reduced using this scheme?
Replies: 29
Views: 2685

Re: Can EGTB storage requirements be reduced using this scheme?

Thanks for the posts, good info. I will do some reading and playing around with code and see where it goes.
by mmt
Sat Dec 12, 2020 2:43 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Can EGTB storage requirements be reduced using this scheme?
Replies: 29
Views: 2685

Re: Can EGTB storage requirements be reduced using this scheme?

How are you going to "mark" a position "as having the true value stored" without encoding this in the value you store for the position? One way could be like I wrote earlier: true value (1 bit, ignoring cursed wins/losses), gap (maybe 7 bits, maybe depends on the endgame), true value, gap... A sort...
by mmt
Fri Dec 11, 2020 6:32 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Can EGTB storage requirements be reduced using this scheme?
Replies: 29
Views: 2685

Re: Can EGTB storage requirements be reduced using this scheme?

Thanks for the post. Since the heuristic won't give distance to mate, you can only do w/d/l with this, so the table would have 6 possible values w/d/l/w50/l50/<search> with <search> being a large majority of the results. I think that cursed win/blessed losses are rare enough that it would be sane to...
by mmt
Fri Dec 11, 2020 1:16 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Can EGTB storage requirements be reduced using this scheme?
Replies: 29
Views: 2685

Re: Can EGTB storage requirements be reduced using this scheme?

What he means is that your call to SF to predict the correct TB value will struggle to return something useful. The accuracy depends a lot on the ending. KQRPvKRB, for example, is 99.5% correct (it's 90% wins, 9% draws, 1% losses, and 10 GB). Before you can think about space savings, you will have ...
by mmt
Wed Dec 09, 2020 8:25 pm
Forum: Computer Chess Club: General Topics
Topic: Draw or white win?
Replies: 7
Views: 741

Re: Draw or white win?

I'm missing just a couple of these EGTBs. I'll download them and let you know the result!
by mmt
Wed Dec 09, 2020 4:09 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Can EGTB storage requirements be reduced using this scheme?
Replies: 29
Views: 2685

Re: Can EGTB storage requirements be reduced using this scheme?

The main problem seems to be recognizing which positions can be left out. Having to do a shallow search on each of the positions in the EGT could take thousand times as long as generating the EGT in the first place. Somebody familiar with SF should be able to find out how much time it takes for SF ...
by mmt
Wed Dec 09, 2020 6:43 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Can EGTB storage requirements be reduced using this scheme?
Replies: 29
Views: 2685

Re: Can EGTB storage requirements be reduced using this scheme?

Average number of nodes needed for SF: 162 Accuracy: 94% Ratio of entropy bits with SF vs original baseline: 0.29 After some more manual optimization of the number of nodes to be calculated and the cutoffs for considering a score to be winning or drawing, the average number of nodes needed is just ...
by mmt
Wed Dec 09, 2020 5:57 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Can EGTB storage requirements be reduced using this scheme?
Replies: 29
Views: 2685

Re: Can EGTB storage requirements be reduced using this scheme?

OK, I ran the sampling code on random positions from 62 Syzygy WDL EGTBs that are over 20 GB each using 1.0 as the eval cutoff. Number of nodes for SF Accuracy percentage Entropy bits per position 50 87% 0.60 100 88% 0.45 200 89% 0.36 400 90% 0.30 800 90% 0.30 1600 91% 0.27 3200 92% 0.20 6400 93% 0...