Search found 16823 matches

by bob
Fri Jun 01, 2007 12:01 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: pthread weirdness
Replies: 26
Views: 12885

Re: pthread weirdness

Bob is right that there are resource usage metering differences among varying pthread implementations; I've seen this between Linux and OpenBSD. Which has the bug? It depends on who you talk with. Linux threads are essentially lightweight processes and are managed as such, so a fork only approach i...
by bob
Thu May 31, 2007 11:57 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Programs on the USCF member list
Replies: 11
Views: 5574

Re: Programs in chronological order of joining

If that is supposedly from oldest to newest in terms of when they joined USCF, the list is wrong. "blitz" was a member in 1974 or thereabouts, and played in USCF events every year after that. Cray Blitz was a member in 1980, which I think predates nuchess, and certainly predates hitech and chiptest/...
by bob
Thu May 31, 2007 4:40 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: pthread weirdness
Replies: 26
Views: 12885

Re: pthread weirdness

all I can say is that I gave up on pthreads a few years ago. I found too many inconsistencies between the various unix and linux implementations. CPU time was problematic as some systems return the cpu time for a thread, while others return the accumulated time for all threads. scheduling policies v...
by bob
Thu May 31, 2007 4:35 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Programs on the USCF member list
Replies: 11
Views: 5574

Re: Programs on the USCF member list

Also some of those ratings have been "deflated" incorrectly. Every now and then USCF "deflates" all ratings (reduces them proportionally) to account for rating inflation over time. Yet many of those programs (belle, cray blitz, hitech, et al) have not played human chess in 20 years or so but their r...
by bob
Thu May 31, 2007 4:30 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: First fail high drops in endgame
Replies: 20
Views: 10399

Re: First fail high drops in endgame

Here's my output for a 20+ second search on fine 70... time=23.10 mat=1 n=94433259 fh=98% nps=4.1M ext-> check=14.0M 1rep=591K mate=0 pp=0 reduce=62.7M/14.0M predicted=0 evals=58.0M 50move=0 EGTBprobes=0 hits=0 SMP-> splits=0 aborts=0 data=0/128 elap=23.10 Note my fh% is 98, which is way above norma...
by bob
Thu May 31, 2007 4:25 pm
Forum: Computer Chess Club: General Topics
Topic: Chris's Crafty Computer Chess Campaign
Replies: 8
Views: 3152

Re: If Crafty plays at WCCC then........

Or the CCCCC for short......is devoted to bringing you the best at this years WCCC. Never let it be said that a former world champion chess engine should not participate because a mere ocean is in the way. So much so that the donation fund has reached the 25 euro entry fee and not before time. June...
by bob
Thu May 31, 2007 1:51 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: First fail high drops in endgame
Replies: 20
Views: 10399

Re: First fail high drops in endgame

Did you ever measure this quantity before (with different result)? It seems normal to me that it is more difficult to find cut-moves in an end-game, as the information that distinguishes the winning from the losing moves is much more distant. In the middle game it is often decided by what is on the...
by bob
Thu May 31, 2007 1:45 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Speedup with bitboards on 64-bit CPUs
Replies: 49
Views: 36429

Re: Quiescence search width

How many moves on average are present at a quiescence node? Counting only captures and promotions, it's usually not too many. I note that Paradise almost always looked at only one move per quiescence node and that included non gainers. What would happen if someone took a traditional AB quiescence s...
by bob
Thu May 31, 2007 1:39 am
Forum: Computer Chess Club: General Topics
Topic: Participants WCCC 2007
Replies: 108
Views: 49469

Re: Participants WCCC 2007

OK... this makes a little more sense now. I was contacted a while back and asked about it. My response was along the lines of this: (a) I'm not going to participate this year as things were thrown together too quickly and there was not enough time to make the kind of preparations we would normally ...
by bob
Thu May 31, 2007 1:38 am
Forum: Computer Chess Club: General Topics
Topic: Participants WCCC 2007
Replies: 108
Views: 49469

Re: Participants WCCC 2007

OK... this makes a little more sense now. I was contacted a while back and asked about it. My response was along the lines of this: (a) I'm not going to participate this year as things were thrown together too quickly and there was not enough time to make the kind of preparations we would normally ...