Search found 938 matches

by chrisw
Thu Jul 09, 2020 7:19 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Question on Texel's Tuning Method
Replies: 13
Views: 384

Re: Question on Texel's Tuning Method

There’s a great deal of power in “averaging”. See the Central Limit Theorem for some mathematical justification of this. I tried to win the “guess the weight of the leg of ham” competition in village event once by going last and trying to do a running average of everybody else’s guesses as they ann...
by chrisw
Thu Jul 09, 2020 7:39 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Question on Texel's Tuning Method
Replies: 13
Views: 384

Re: Question on Texel's Tuning Method

I think the normal Texel method is sound enough, because what you in fact do is tune the evaluation to the average score of many very similar positions. And yes, that includes positions that are slightly better, but were still lost. But on average the number of wins from positions that are slightly...
by chrisw
Tue Jul 07, 2020 10:54 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Stockfish has included WDL stats in engine output
Replies: 43
Views: 1400

Re: Stockfish has included WDL stats in engine output

Well, but, except. SF, and probably most AB programs, has actually “generated” additive centipawn scoring components by essentially reversing win rate back into additive weights. Isn’t that how the linear tuning works? Good luck plugging test run win rates into your evaluation function. We'll conti...
by chrisw
Tue Jul 07, 2020 7:55 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Stockfish has included WDL stats in engine output
Replies: 43
Views: 1400

Re: Stockfish has included WDL stats in engine output

Well, but, except. SF, and probably most AB programs, has actually “generated” additive centipawn scoring components by essentially reversing win rate back into additive weights. Isn’t that how the linear tuning works? Good luck plugging test run win rates into your evaluation function. We'll conti...
by chrisw
Mon Jul 06, 2020 10:34 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Stockfish has included WDL stats in engine output
Replies: 43
Views: 1400

Re: Stockfish has included WDL stats in engine output

My point is that it is simple to convert an existing alpha beta engine to work with win probabilities (or should I say win or draw probabilities to satisfy you). Using my way of probabilities in alpha beta has many obvious advantages as I mentioned in my previous post. An additional gain is that ca...
by chrisw
Fri Jul 03, 2020 3:52 pm
Forum: Computer Chess Club: General Topics
Topic: WDL
Replies: 45
Views: 1400

Re: WDL

As many of know, NN engines have been reporting WDL data with Scoring Percentage for some time. A while back, I took their formula to convert to a centipawn and applied it the centipawn evaluation to come u It is worth noting that Stockfish's WDL is a function of both the evaluation and the current...
by chrisw
Fri Jul 03, 2020 3:43 pm
Forum: Computer Chess Club: General Topics
Topic: A community project CCMT
Replies: 28
Views: 771

Re: A community project CCMT

I have been working on a test set recently, but today I thought to myself, "There are a lot of smart people on CCC who could help make this into a really great test set." Here is the current list: 8/pP6/kpP3p1/brpPb1p1/1pP1PbP1/1P6/K5P1/8 w - - bm Kb1; 7n/3P4/n2K2kp/2p4N/Bb6/2p1p1P1/8/8 w - - bm Nf...
by chrisw
Thu Jul 02, 2020 4:36 pm
Forum: Computer Chess Club: General Topics
Topic: Leela outplays Spike from what should be a drawn endgame
Replies: 5
Views: 316

Re: Leela outplays Spike from what should be a drawn endgame

While I was testing Leela on what most would call a weak GPU (MX150) versus a standard Desktop using various engines I came across the following position in a game between Spike 1.4 and Leela. 4r1k1/6b1/p6p/1p1P4/4P3/2P5/PP4PP/4R2K b - - 0 31 Since Spike had Tablebases installed I figured the game ...
by chrisw
Mon Jun 29, 2020 5:52 pm
Forum: Computer Chess Club: General Topics
Topic: Stockfish Handicap Matches
Replies: 195
Views: 4023

Re: Stockfish Handicap Matches

Would he be allowed to play the game himself on chess.com while commenting on his own site? That would avoid a lot of problems, including the time delay for me to observe and make his move, the chance of a mistake by me, and the issue of having to play as myself while actually making his moves? The...
by chrisw
Mon Jun 29, 2020 11:01 am
Forum: Computer Chess Club: General Topics
Topic: Website engines
Replies: 24
Views: 1038

Re: Website engines

A try to collect the websites of engine authors among other things. http://rebel13.nl/download/download-engines.html 1. Engines listed on alphabet, click on the picture to move to the author's web site. 2. ELO's are based on the CCRL 40/2 rating list of June 2020 on a single processor. 3. When a we...