Search found 8210 matches

by Dann Corbit
Wed Jul 31, 2019 8:16 pm
Forum: Computer Chess Club: General Topics
Topic: refuted opening lines
Replies: 6
Views: 1153

Re: refuted opening lines

Here are some opening positions with a computer evaluation of -150 centipawns or worse which were played at least 50 times in my database. They are sorted so that the most frequently occurring are on top. There are a few that are questionable (where the cce value is a lot better for the side to mov...
by Dann Corbit
Wed Jul 31, 2019 6:59 pm
Forum: Computer Chess Club: General Topics
Topic: 7 Man Syzygy and SSD
Replies: 73
Views: 11125

Re: 7 Man Syzygy and SSD

If you examine the TCEC games, you will see that there are hundreds of millions of TB hits during search. The bandwidth problem is an enormous problem today. By the time the files are generated, it will be possible to download them in a reasonable time and store them at a reasonable cost. That havin...
by Dann Corbit
Wed Jul 31, 2019 6:09 pm
Forum: Computer Chess Club: General Topics
Topic: Smith Morra Bust?
Replies: 24
Views: 2639

Re: Smith Morra Bust?

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - acd 70; acs 1589745; bm c4; c1 "01a"; c2 "perft 1 20 perft 2 400 perft 3 8902 perft 4 197281 perft 5 4865609 perft 6 119060324"; c3 "e4"; c4 "e4"; cce 38; ce 8; pm e4 {2379495} d4 {1725526} Nf3 {483679} c4 {479713} g3 {39820} f4 {35589} b3 {27764...
by Dann Corbit
Tue Jul 30, 2019 11:48 pm
Forum: Computer Chess Club: General Topics
Topic: refuted opening lines
Replies: 6
Views: 1153

Re: refuted opening lines

Here are some opening positions with a computer evaluation of -150 centipawns or worse which were played at least 50 times in my database. They are sorted so that the most frequently occurring are on top. There are a few that are questionable (where the cce value is a lot better for the side to move...
by Dann Corbit
Sun Jul 28, 2019 1:10 am
Forum: Computer Chess Club: General Topics
Topic: Database snapshot
Replies: 76
Views: 6685

Re: Database snapshot

For those who want to probe my database locally or for other unspecified reasons, here is a full database snapshot of my book project as of today: ftp://ftp.chessdb.cn/pub/chessdb/data-snapshot-20190728.tar The database contains about 3 billion unique chess positions, mostly connected to startpos, ...
by Dann Corbit
Sun Jul 28, 2019 1:07 am
Forum: Computer Chess Club: General Topics
Topic: Stockfish vs. Lc0: IMHO disappointing result for Lc0
Replies: 37
Views: 3088

Re: Stockfish vs. Lc0: IMHO disappointing result for Lc0

If I'd run 100 or a 1000 games, I'd roughly expect the result to be "+30 -5 =65" or "+300 -50 =650" in favor of Stockfish 10 on this computer, give or take a few points. I'm not going to put any more time into this. I would have tested more, if all the 20 games were drawn, and if the games where so...
by Dann Corbit
Sun Jul 28, 2019 12:58 am
Forum: Computer Chess Club: General Topics
Topic: future of top engines:how much more elo?
Replies: 124
Views: 10574

Re: future of top engines:how much more elo?

One should be enough, mainly, the top one of the 40/4 list. At the very least, playing 1000 games between that top engine and the ones from 40/40, get a rating and calibrate for that rating the entire 40/40 list would be better than what we have now. Much, much better. I don't think that approach w...
by Dann Corbit
Sat Jul 27, 2019 8:38 am
Forum: Computer Chess Club: General Topics
Topic: Poly 1.5 - Book tuning by WDL
Replies: 2
Views: 411

Re: Poly 1.5 - Book tuning by WDL

For number 2, I would suggest that both pieces of information are valuable. Also, the type of measurement affects how trusable it is, Consider a 50 ply search by SF, or a one hour search by LC0 I trust those measurements a lot, Shall we replace the move suggestion and score with information based on...
by Dann Corbit
Sat Jul 27, 2019 8:33 am
Forum: Computer Chess Club: General Topics
Topic: future of top engines:how much more elo?
Replies: 124
Views: 10574

Re: future of top engines:how much more elo?

Ovyron wrote:
Fri Jul 26, 2019 3:47 am

So it looks like a flaw in their calibration, and it's easy to fix.
Aside from playing a few hundred thousand games with some engines at the slow time control verses engines running the fast time control, i would be curious to know what your easy fix is
by Dann Corbit
Wed Jul 24, 2019 10:07 pm
Forum: Computer Chess Club: General Topics
Topic: future of top engines:how much more elo?
Replies: 124
Views: 10574

Re: future of top engines:how much more elo?

As long as you don't use the absolute numbers as a reference, comparing lists isn't silly. There may be some minor differences due to scaling implementations, but for the most part, a carefully prepared ranking list will look a lot like another ranking list at a different time control or thread coun...