Search found 3607 matches

by jdart
Thu Jun 20, 2019 1:07 am
Forum: Computer Chess Club: General Topics
Topic: Arasan test suite - draft version
Replies: 8
Views: 198

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: 4
Views: 145

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: 8
Views: 198

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: 8
Views: 198

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: 1468

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: 1023

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
by jdart
Mon Jun 03, 2019 1:00 pm
Forum: Computer Chess Club: General Topics
Topic: Why are super top professional Go players so stupid?
Replies: 28
Views: 1924

Re: Why are super top professional Go players so stupid?

Suboptimal moves are very common in GM chess games and losing blunders are not infrequent. This is known for a long time. Good players can be very accurate at times, but being accurate all the time over the whole course of a game is very difficult.

--Jon
by jdart
Thu May 23, 2019 11:43 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Possible "real" hash collision
Replies: 27
Views: 1874

Re: Possible "real" hash collision

It is well known that you must not rely on the hash table for anything that is dangerous if inaccurate. For example I used to retrieve check status (is side to move in check?). But in case of a collision, getting this wrong could cause a crash. That said, there are many other possible causes of cras...
by jdart
Tue May 14, 2019 12:49 pm
Forum: Computer Chess Club: General Topics
Topic: Wb2uci adaptor
Replies: 8
Views: 626

Re: Wb2uci adaptor

You didn't say (and maybe the CCC team didn't say) what the issue was. I use cutechess-cli with Winboard protocol all the time, and have had no issues. You can use the -debug flag to cutechess-cli to get all engine output/input logged, which can be helpful in finding engine-specific issues.

--Jon
by jdart
Mon May 13, 2019 1:27 am
Forum: Computer Chess Club: General Topics
Topic: interesting game
Replies: 2
Views: 336

interesting game

This was played on playchess.com com. Komodo seemed clueless that it was heading into a lost position. At this point: 1k6/3b4/1b1q4/8/8/pPQp1PP1/P5KP/4R3 b - - 0 31 White has what looks like a material advantage (Rook + 3 pawns vs. 2 bishops) but in fact White is probably lost at this point. Best is...