Search found 51 matches

by Ross Boyd
Sat Mar 17, 2018 12:29 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Problem position using Scorpio Egbbs
Replies: 21
Views: 5331

Re: Problem position using Scorpio Egbbs

Yes I understand it, what I am actually trying to address (my mistake) is that of all the positions that I found, this is the first time that e.p capture is not possible after a 2-step pawn push.
Yes, now I see what you meant. Thanks Ferdinand, for your help pinning it down.
by Ross Boyd
Sat Mar 17, 2018 8:39 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Problem position using Scorpio Egbbs
Replies: 21
Views: 5331

Re: Problem position using Scorpio Egbbs

This turns out to be a feature than a bug in the new bitbases :) Enpassant, like castling, is not accounted for during generation of the bitbases. The older ones may have had enpassant though (my memory is blurred on this) since i had a different generator; it was not a retrograde generator like th...
by Ross Boyd
Thu Mar 15, 2018 6:59 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Problem position using Scorpio Egbbs
Replies: 21
Views: 5331

Re: Problem position using Scorpio Egbbs

This turns out to be a feature than a bug in the new bitbases :) Enpassant, like castling, is not accounted for during generation of the bitbases. The older ones may have had enpassant though (my memory is blurred on this) since i had a different generator; it was not a retrograde generator like th...
by Ross Boyd
Mon Mar 12, 2018 11:12 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Problem position using Scorpio Egbbs
Replies: 21
Views: 5331

Re: Problem position using Scorpio Egbbs

I have tested the position with DanaSah and with different distributions of egbb (egbb6men, egbb5men, egbb4men). All with dll version 4.1 32-bit The result is a win for Black. Gaviota Tablebases indicates draw. With dll 3.1 and egbb4men danasah has draw. I took some games from Frank's page, extract...
by Ross Boyd
Mon Mar 12, 2018 10:31 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Problem position using Scorpio Egbbs
Replies: 21
Views: 5331

Re: Problem position using Scorpio Egbbs

Hey Graham, long time. Good to see you're still enjoying CC. Yes, things move slowly round these parts... would you believe I have a (32bit only) compiled Basic program called Carnage. It plays worse than TRACE. A 1 sec/move tournament now after 55 games so far puts it 150 Elo behind TRACE. So much ...
by Ross Boyd
Mon Mar 12, 2018 8:26 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Problem position using Scorpio Egbbs
Replies: 21
Views: 5331

Re: Problem position using Scorpio Egbbs

Thanks Pedro. That confirms it.

I've contacted Daniel. Have to wait and see...
by Ross Boyd
Sun Mar 11, 2018 7:33 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Problem position using Scorpio Egbbs
Replies: 21
Views: 5331

Re: Problem position using Scorpio Egbbs

Thank you for looking into it. It appears there is indeed a problem with either the egbbs or the probe dll - not sure yet.

I wonder if anyone else has the same issue - or can shed some light?
by Ross Boyd
Sun Mar 11, 2018 6:20 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Problem position using Scorpio Egbbs
Replies: 21
Views: 5331

Re: Problem position using Scorpio Egbbs

Thanks Ferdinand

If you evaluate the position without any search - just a straight probe, do you still get a draw score?
Are you running 64bit? And what version of egbbdll.dll?

I've downloaded the 5 man set (EGBB5N from Joshua's site) now and still getting the error. Strange...
by Ross Boyd
Sun Mar 11, 2018 3:01 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Problem position using Scorpio Egbbs
Replies: 21
Views: 5331

Problem position using Scorpio Egbbs

Greetings, it's many many years since I've posted here. :) My hobby engine has a problem with this position using Scorpio egbb's. It scores a Black win for this position. It should be a draw. [d]8/p7/8/1P4k1/7p/8/7K/8 w - - probe_egbb_fen() also returns the same result. The engine is 32 bit and uses...
by Ross Boyd
Tue Aug 24, 2010 10:17 am
Forum: Computer Chess Club: Tournaments and Matches
Topic: GM Kaufman v.Novag Constellation 3.6 QR Odds (Moves 41-55)
Replies: 81
Views: 18159

Re: GM Kaufman v.Novag Constellation 3.6 QR Odds (Moves 41-O

Thanks to Larry and Steve for this game.
I enjoyed following it immensely.

And bravo Larry!