Search found 486 matches

by D Sceviour
Wed Jan 22, 2020 6:26 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Is razoring useless in modern engines ?
Replies: 9
Views: 676

Re: Is razoring useless in modern engines ?

The last time I looked at this, there was a relationship between Razoring and ProbCut. Removing either one made little difference to the score, but removing them both showed a deterioration in play. It might be worth re-looking at the interaction between Razoring and ProbCut. Maybe Razoring is a fas...
by D Sceviour
Sat Jan 18, 2020 10:11 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: On-line engine blitz tourney January
Replies: 9
Views: 440

Re: On-line engine blitz tourney January

This is Schooner's first win in the monthly ICS tournament. The results was marred with a time forfeit by BelFish, but the games were all very exciting. In particular, I like the game against host NightmareX. Black pummeled the white queen out of the opening, and white never stood a chance. Thank yo...
by D Sceviour
Sun Jan 05, 2020 9:05 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: FGRL 60 min + 15 sec Rating list - Schooner 2.2, Lc0 v0.23.1 LD2, Arasan 22.0
Replies: 3
Views: 358

Re: FGRL 60 min + 15 sec Rating list - Schooner 2.2, Lc0 v0.23.1 LD2, Arasan 22.0

For the 60 min + 15 sec rating list, I take the opening book from the Stockfish Testing Framework, the 8moves_v3.pgn with 34700 opening lines. The games are repeated with reversed colors. You are right, 8 ... Qf6 is the last book move. Komodo 13.2 as white didn't play 9. f4!, but 9. exf5 (0.63/28 1...
by D Sceviour
Wed Jan 01, 2020 4:36 pm
Forum: Computer Chess Club: General Topics
Topic: Schooner Version 2.2 Release
Replies: 36
Views: 2916

Re: Schooner Version 2.2 Release

Most engines nowadays use "LazySMP" based approaches, which derive from the shared hash table concept, and actually scale quite well elo-wise with many threads (best approach known for 16+, and good for 8 or less). Open source code to study is available from Stockfish, Ethereal, and many others, an...
by D Sceviour
Thu Dec 26, 2019 7:36 pm
Forum: Computer Chess Club: General Topics
Topic: Schooner Version 2.2 Release
Replies: 36
Views: 2916

Re: Schooner Version 2.2 Release

By poor SMP scaling, I mean that the elo gains from additional cores/threads were significantly lower for Schooner than for most engines. Not really a worry at 2C or 4C where the gains are still good, but significant on tournament hardware with dozens of cores. I do not have dozens of cores to test...
by D Sceviour
Thu Dec 26, 2019 7:09 pm
Forum: Computer Chess Club: General Topics
Topic: Schooner Version 2.2 Release
Replies: 36
Views: 2916

Re: Schooner Version 2.2 Release

I'd be happy to see how the latest Schooner does in tournaments. I remember it had poor SMP scaling one year ago, has this been improved on ? What do you mean by poor SMP scaling? Could you be more specific? The threading was crashing sometimes during multiple instances of concurrent games on CuteC...
by D Sceviour
Thu Dec 26, 2019 6:02 pm
Forum: Computer Chess Club: General Topics
Topic: Schooner Version 2.2 Release
Replies: 36
Views: 2916

Re: Schooner Version 2.2 Release

Denis, although you have no interest in tournament play, would you be upset if TCEC or CCC downloaded Schooner from the website and used it in tournament play without consulting you? There is no way to stop anyone from posting material about chess engines on other domains. In the case of TCEC and C...
by D Sceviour
Thu Dec 26, 2019 3:35 pm
Forum: Computer Chess Club: General Topics
Topic: Schooner Version 2.2 Release
Replies: 36
Views: 2916

Re: Schooner Version 2.2 Release

FastGM's 10+6 list says that Schooner 2.2 is now the 7th best AB engine out there. Better than Fizbo, Andscacs, Laser, Defenchess, Fritz and Shredder. 65 Elo improvement. Nice going :D It would be really good to see it particpating in TCEC and CCC, provided it can run on Linux and cope with big har...
by D Sceviour
Tue Dec 24, 2019 5:31 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: FGRL rating list - 10 min, Schooner 2.2, Arasan 22.0
Replies: 5
Views: 528

Re: FGRL rating list - 10 min, Schooner 2.2, Arasan 22.0

fastgm wrote:
Tue Dec 24, 2019 8:36 am
FGRL rating list - 10 min + 6 sec

Schooner 2.2 (+65 to Schooner 2.1)
Arasan 22.0 (+30 Arasan 21.4)

http://www.fastgm.de
Lars Hallestrom estimated a +35 increase but you seem to be getting a lot more out of Schooner! Congratulations :)
by D Sceviour
Tue Dec 24, 2019 3:54 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Pascal code to read a Polyglot book
Replies: 13
Views: 652

Re: Pascal code to read a Polyglot book

find_key() works as follows. The polyglot keys are store sequentially in the book. find_key() performs a half-cut search to quickly locate the key. For the procedure move_to_string(), polyglot book stores the move in a reverse endian format. I know nothing about Pascal, but some C code may be of som...