Search found 3611 matches

by jdart
Tue Jun 25, 2019 2:33 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: How many elo gain a good Opening book have on Stockfish?
Replies: 5
Views: 349

Re: How many elo gain a good Opening book have on Stockfish?

It probably depends on whether you are talking about self-play or play against an opponent. The draw rate in self-play (Stockfish vs. Stockfish) is very high. The openings matter less than you might think. Stockfish is pretty good at drawing at least even from somewhat inferior positions. So Stockfi...
by jdart
Sun Jun 23, 2019 6:42 pm
Forum: Computer Chess Club: General Topics
Topic: Arasan test suite - draft version
Replies: 24
Views: 775

Re: Arasan test suite - draft version

hi John, id like to thank you for the new suite !! here are 2 (3) more testpositions i came accross over the last few months, maybe they are of interest for you as well (all about king-safety): 1. r1bq1r2/1ppnbpkp/n2p2p1/p2Pp3/2P1P1P1/2N1BN2/PP1KBP2/R2Q3R w - - 0 1 1. Rxh7+ Kxh7 2. Qh1+ Kg8 3. Qh6 ...
by jdart
Fri Jun 21, 2019 7:26 pm
Forum: Computer Chess Club: General Topics
Topic: Arasan test suite - draft version
Replies: 24
Views: 775

Re: Arasan test suite - draft version

This is another one I have been looking at recently - I don't think this is in the set I posted: 8/4k3/8/1P2b1PP/8/3pQ3/5PK1/3q4 b - - bm Ke6; c0 "Arasan-acgs, ICC 2019"; 8/4k3/8/1P2b1PP/8/3pQ3/5PK1/3q4 b - - Stockfish 10 and Houdini 6 get this pretty rapidly at a depth under 30 or so, but my engine...
by jdart
Thu Jun 20, 2019 3:09 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Using Linux To Test Engines
Replies: 5
Views: 260

Re: Using Linux To Test Engines

Several Linux-compatible engines including Crafty, Arasan, Stockfish have a variable strength level. So you could adjust those to the rating range you need.

--Jon
by jdart
Thu Jun 20, 2019 1:07 am
Forum: Computer Chess Club: General Topics
Topic: Arasan test suite - draft version
Replies: 24
Views: 775

Re: Arasan test suite - draft version

Vinvin wrote:
Thu Jun 20, 2019 12:30 am
4r1k1/1ppr1p1p/1nnq2p1/p3pP2/5P2/3PP2Q/4B2P/B1R3RK w - - bm Rcf1 Re3;
bad solution move : Re3 is not possible in this position.
Rcf1 is best here I think. I don't see another equally good move: next best is Bf3 it seems.

--Jon
by jdart
Wed Jun 19, 2019 11:24 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Using Linux To Test Engines
Replies: 5
Views: 260

Re: Using Linux To Test Engines

You don't need a batch script. Best bet is to make yourself an engines.json file and put the command to start the engine into that. So the "command" part of the engine config would be something like "wine engine.exe". Of course if the engines you are matching have Linux executables (quite a few do) ...
by jdart
Wed Jun 19, 2019 7:44 pm
Forum: Computer Chess Club: General Topics
Topic: Arasan test suite - draft version
Replies: 24
Views: 775

Re: Arasan test suite - draft version

Thanks - I removed the dups.

--Jon
by jdart
Wed Jun 19, 2019 6:12 pm
Forum: Computer Chess Club: General Topics
Topic: Arasan test suite - draft version
Replies: 24
Views: 775

Arasan test suite - draft version

Over the past several months, I have gone through the current Arasan test suite and removed some positions that seem too easy, and also added a bunch that are interesting and/or harder. Some of the latter have been posted here, but some have not. I've verified all the positions as best I can using m...
by jdart
Thu Jun 06, 2019 1:27 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Hash collision?
Replies: 42
Views: 1624

Re: Hash collision?

I store two 64-bit words in the hash table. 16 bits of the hash field are used to store some other data, so 48 bits of hash are stored. But since the low order bits of the hash code are used to select a hash "bucket", effectively 64 bits of hash are used if the hash size is > 65536 entries. Empirica...
by jdart
Tue Jun 04, 2019 10:20 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: strategies for finding slowdows in lazy smp
Replies: 26
Views: 1176

Re: strategies for finding slowdows in lazy smp

A profiler might also be helpful. You could try OProfile for Linux (http://oprofile.sourceforge.net/news/).

--Jon