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by mcostalba
Tue Oct 03, 2017 7:30 am
Forum: Computer Chess Club: General Topics
Topic: Stockfish Natural TB loses heavily to Stockfish master
Replies: 169
Views: 31353

Re: Stockfish Natural TB loses heavily to Stockfish master

The state of SF NTB4 as of today: Thanks for testing correctness of NTB4 on 6-men: this is a valuable contribution. Instead your metric of converting x-men wins with (x-1)-men installed is metric that makes no sense at all. Of course you are free to test with whatever you want, you can also find ho...
by mcostalba
Sun Oct 01, 2017 9:01 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Size of Transposition Table Entry
Replies: 29
Views: 5578

Re: Size of Transposition Table Entry

lucasart wrote:It was there in Glaurung.
Glaurung didn't need to do it becuase it was evaluating only at the leafs. But of course it is not a SF novelity.
by mcostalba
Sun Oct 01, 2017 8:20 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Size of Transposition Table Entry
Replies: 29
Views: 5578

Re: Size of Transposition Table Entry

In Houdini 5 and 6 I've dumped the second move in favor of some evaluation-related information, which proved to be a more profitable usage. With evaluation-related information perhaps you mean you store the static eval in TT? C'mon don't be shy, you can say it....hey, now that I look better....we a...
by mcostalba
Tue Sep 19, 2017 4:33 pm
Forum: Computer Chess Club: General Topics
Topic: Stockfish Natural TB loses heavily to Stockfish master
Replies: 169
Views: 31353

Re: Stockfish Natural TB loses heavily to Stockfish master

Thanks Kai for the test. Test was aimed at position starting from TB and it was ok it seems. Regarding other tests, starting from a position just before TB, sorry but this does not make a lot of sense to me. If you want to compare for instance on mate length then please test from starting position o...
by mcostalba
Mon Sep 18, 2017 7:30 pm
Forum: Computer Chess Club: General Topics
Topic: Stockfish Natural TB loses heavily to Stockfish master
Replies: 169
Views: 31353

Re: Stockfish Natural TB loses heavily to Stockfish master

Ok, here is my next attempt:

https://github.com/mcostalba/Stockfish/archive/NTB3.zip

I have extensively tested on 5-men and it works for me, it keeps the draws, converts the wins and is supposed to avoid silly sacrifices (although on 5-men testing this is limited).
by mcostalba
Fri Sep 15, 2017 8:16 am
Forum: Computer Chess Club: General Topics
Topic: Stockfish Natural TB loses heavily to Stockfish master
Replies: 169
Views: 31353

Re: Stockfish Natural TB loses heavily to Stockfish master

Kay, do you want to get some fun? Get ready to have fun, I will post shortly the version with included no-silly sacrifices. Ronald, working by attempt is my way to develop (and in case you didn't notice it is 8 years that SF development works in this way). Ronald, rewriting code that already works e...
by mcostalba
Wed Sep 13, 2017 7:52 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Syzygy probing code: DTZ in some cursed endgames off by one?
Replies: 23
Views: 3655

Re: Syzygy probing code: DTZ in some cursed endgames off by

All this craziness just to save 1 bit?

Probably you have measured the saved space and probably we are talking of some tens or hundred of MB..otherwise I really can't understand this design choice...
by mcostalba
Thu Sep 07, 2017 8:31 am
Forum: Computer Chess Club: General Topics
Topic: Stockfish Natural TB loses heavily to Stockfish master
Replies: 169
Views: 31353

Re: Stockfish Natural TB loses heavily to Stockfish master

Kai, thanks for keeping testing, this is useful. I have already copied your hard position and doing some tests locally.

But in this case your test is flawed (as already pointed out): if for instance SF NTB is programmed to only show mate in 1 it would easily win your statistic....
by mcostalba
Wed Sep 06, 2017 7:03 am
Forum: Computer Chess Club: General Topics
Topic: Stockfish Natural TB loses heavily to Stockfish master
Replies: 169
Views: 31353

Re: Stockfish Natural TB loses heavily to Stockfish master

At this time control, SF FNTB fails in 11 conversions out of 1000 Draws against SF master. Thanks Kay for testing NTB! Could you please post the pgn of some game where SF fails to keep the draw? This should not happen. Never. Instead converting the win is another story. Let me clarify. SF NTB is al...
by mcostalba
Sat Sep 02, 2017 8:29 am
Forum: Computer Chess Club: General Topics
Topic: Why McBrain?
Replies: 24
Views: 4631

Re: Why McBrain?

Stockfish Natural TB $ ./stockfish Stockfish 020917 64 POPCNT by T. Romstad, M. Costalba, J. Kiiski, G. Linscott info string Found 145 tablebases position fen 1r4rk/4Nq2/7K/8/8/6R1/b5Q1/6R1 w - - 0 1 d +---+---+---+---+---+---+---+---+ | | r | | | | | r | k | +---+---+---+---+---+---+---+---+ | | | ...