Search found 3804 matches

by jdart
Mon May 28, 2007 4:04 am
Forum: Computer Chess Club: General Topics
Topic: SpiderChess 070525 is released....
Replies: 11
Views: 5411

Re: SpiderChess 070525 is released....

Since this doesn't come with an opening book and since I had a small book file handy in almost the right format, I made a minimal set of opening books. These are available from: http://www.arasanchess.org/SpiderBlack.bk http://www.arasanchess.org/SpiderWhite.bk No guarantees as to quality. The repet...
by jdart
Sat May 26, 2007 4:05 am
Forum: Computer Chess Club: General Topics
Topic: About 10% of the WCSAC EPD positions are broken.
Replies: 5
Views: 2563

Re: About 10% of the WCSAC EPD positions are broken.

The fact that Rybka gave the "correct" solution does not mean there are not other alternate solutions. This test suite in particular has a lot of positions where there's something like a mate in 4 and an alternative mate in 5. Many programs will find the mate in 5 first (because of move ordering) an...
by jdart
Sat May 26, 2007 3:01 am
Forum: Computer Chess Club: General Topics
Topic: About 10% of the WCSAC EPD positions are broken.
Replies: 5
Views: 2563

Re: About 10% of the WCSAC EPD positions are broken.

I think more than 10% are broken, over 50% I would guess. I stopped using this test suite a while ago.

As you say there are alternate mate sequences in many cases. But there are also positions where there is no clear best move, or the supplied solution is not best.

--Jon
by jdart
Fri May 25, 2007 4:43 pm
Forum: Computer Chess Club: General Topics
Topic: Eigenmann Endgame Test
Replies: 15
Views: 6455

Re: Eigenmann Endgame Test

>Do mean they will never get it or it takes 10 times longer?

Never. But I have tried scaling back null move and, while it "fixes" corner case like this, it caused overall performance to suffer.
by jdart
Fri May 25, 2007 2:01 pm
Forum: Computer Chess Club: General Topics
Topic: Eigenmann Endgame Test
Replies: 15
Views: 6455

Re: Eigenmann Endgame Test

I took a look at this position recently (#39):

[D] k2N4/1qpK1p2/1p6/1P4p1/1P4P1/8/8/8 w - -

I think this is less a test of endgame knowledge than a null move test - if your program allows null move with reduced material, it will fail this.

--Jon
by jdart
Mon May 21, 2007 12:36 am
Forum: Computer Chess Club: General Topics
Topic: Lowest spec PC to run engine matches
Replies: 27
Views: 8715

Re: Lowest spec PC to run engine matches

I agree. It is very hard to find a "bargain" computer on ebay. If you're shopping for a workstation or server you can find some deals but not desktop PCs. Most listings are new machines and for used ones, finding one of reasonable age/condition and attractive price is difficult.
by jdart
Fri May 18, 2007 5:27 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: winboard/ICC issue
Replies: 4
Views: 4005

winboard/ICC issue

Lately I've been observing a problem where my program stops accepting matches on ICC. Following is a bit of winboard debug log (Winboard version is 4.2.7a): 6638422 <first : (debug) got cmd (main): ping 6 6638422 <first : (debug) do_command: ping 6 6638422 <first : pong 6 6638422 <first : (debug) in...
by jdart
Thu May 17, 2007 4:28 am
Forum: Computer Chess Club: General Topics
Topic: test position from SCCT
Replies: 6
Views: 2803

Re: test position from SCCT

Do you get a + score for Black?

Fritz played Rc1 in reply and lost quickly. Rxc7 is a much better try but Black is still ahead after that.

--Jon
by jdart
Thu May 17, 2007 3:32 am
Forum: Computer Chess Club: General Topics
Topic: test position from SCCT
Replies: 6
Views: 2803

test position from SCCT

This was played in an offline tournament run by Sedat Canbaz, Deep Fritz 10 vs. Zap!Chess Paderborn: [D] 2q1r3/R1b3pk/2N2p1p/1P3b2/8/4p2P/4Q1P1/3R3K b - - Zap!Chess played Bxh3, which is the best move here. Arasan can find this after a *long* time. I think it is not easy, but was within reach for Za...
by jdart
Thu May 17, 2007 3:07 am
Forum: Computer Chess Club: General Topics
Topic: Barfoed-Edwards, corr. W-22ch sf01 1997
Replies: 5
Views: 2542

Barfoed-Edwards, corr. W-22ch sf01 1997

[D] R4bk1/5p2/4q2p/7Q/4PpP1/1r1r1N2/R4PK1/8 w - -

bm Ng5 (this is superior to Ne5). This one is pretty hard.

--Jon