Search found 3603 matches

by jdart
Thu Jun 06, 2019 1:27 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Hash collision?
Replies: 42
Views: 1433

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: 977

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: 1885

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: 1818

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: 625

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: 335

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...
by jdart
Fri May 10, 2019 1:19 am
Forum: Computer Chess Club: General Topics
Topic: h4 wins
Replies: 4
Views: 533

Re: h4 wins

Houdini 6 finds it pretty fast, too.

--Jon
by jdart
Thu May 09, 2019 3:33 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Tunguska 1.1 STS test results - improve eval
Replies: 9
Views: 732

Re: Tunguska 1.1 STS test results - improve eval

mobility area being "enemy or empty squares, also exclude opp king square and ranks 1 and 2" does not make much sense to me. I'd just include empty squares and exclude squares attacked by enemy pawns, at least for starters. Commonly pawns that are attacked are part of a chain and actually restrict m...
by jdart
Mon May 06, 2019 3:58 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: SPCC: Testruns of Xiphos 0.5.3 and Lc0 JH.T6.532 finished
Replies: 5
Views: 554

Re: SPCC: Testruns of Xiphos 0.5.3 and Lc0 JH.T6.532 finished

Seems that 39. ... g6 is the last irreversible move. So it is "on the edge" of the 50 moves rule. Can I get the complete pgn from this game so I can test myself? Seems that I cannot just copy it from the post as the starting fen isn't there. ./Andreas This is the PGN: [Event "?"] [Site "?"] [Date "...
by jdart
Mon May 06, 2019 12:42 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: SPCC: Testruns of Xiphos 0.5.3 and Lc0 JH.T6.532 finished
Replies: 5
Views: 554

Re: SPCC: Testruns of Xiphos 0.5.3 and Lc0 JH.T6.532 finished

I was looking at the following game and was examining this position: 3r4/1pq2pk1/p2N2p1/P1P1p2p/QP1bPp2/5P1P/6P1/2R4K w - - 0 89 where Fire played the winning fork Ne8+. I was puzzled why my engines were showing a draw score. But if you look back in the game, I believe the last irreversible move was...