Search found 2909 matches

by Evert
Sat Feb 05, 2011 4:47 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Getting ready for Thermopylae
Replies: 56
Views: 6469

Re: Getting ready for Thermopylae

My only experience is with determining piece values (which I shared with you). Another tuning method I use is watching games, to spot things that seem obviosly wrong froma strategicpoint of view. (Like advancing passers too early, so they are lost.) I currently use h:100/C:300/L:310/K:475/G:725/W:8...
by Evert
Sat Feb 05, 2011 4:41 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Getting ready for Thermopylae
Replies: 56
Views: 6469

Re: Getting ready for Thermopylae

Also mobility may be important but probably too costly in mailbox board representation. Is it? I don't actually know, but it is used there, right? I think mobility may well be the easiest way to make a general engine, if done properly. The reason I think so is that OliThink is reasonably strong usi...
by Evert
Sat Feb 05, 2011 4:21 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Getting ready for Thermopylae
Replies: 56
Views: 6469

Re: Getting ready for Thermopylae

In other news, the version of Sjaak I sent to you earlier may be fine. I still haven't found the problem, but testing older revisions shows that the problems I have now have been introduced either shortly before or after the revision I sent you. I'll test that exact version and let you know. Prelim...
by Evert
Sat Feb 05, 2011 2:12 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Getting ready for Thermopylae
Replies: 56
Views: 6469

Re: Getting ready for Thermopylae

I think it would be justified to grant a special status to Pawns / Hoplites. (you know, 'soul of the game' and that). They are relly not normal pieces: 1) Their moves are irreversible 2) They are tactically inept 3) They promote to a piece strong enough to decide the game Most Chess variants do hav...
by Evert
Sat Feb 05, 2011 1:10 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Getting ready for Thermopylae
Replies: 56
Views: 6469

Re: Getting ready for Thermopylae

Spartacus also does not have any real King Safety yet. (In normal Chess it just tries to freeze the King on c1/g1, and the a/b/c or f/g/h Pawns on 2nd rank, through the piece-square tables). I use a modified version of the king safety algorithm described by Ed Schroeder. The main difference is I us...
by Evert
Sat Feb 05, 2011 12:57 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Getting ready for Thermopylae
Replies: 56
Views: 6469

Re: Getting ready for Thermopylae

Another difficulty I encountered is passed pawn & hoplite eval. The hoplite movement make things difficult. They move diagonally and you can't tell if a pawn is passed or not at least not that easily. Same goes also for passed hoplites. What I did is to just stick with absolute passed pawns on the ...
by Evert
Sat Feb 05, 2011 3:05 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Getting ready for Thermopylae
Replies: 56
Views: 6469

Re: Getting ready for Thermopylae

I use MVV instead of SEE, as I wanted to have something that works for all alien games f.i checkers. Before that I had big tree explosions but I think difference between MVV and SEE is not much. SEE is an in accurate localized queiscence search that should be very fast to compute. Should do more-or...
by Evert
Sat Feb 05, 2011 1:39 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Getting ready for Thermopylae
Replies: 56
Views: 6469

Re: Getting ready for Thermopylae

well it looks like the Persians are envious of the two spartan kings ;) This reminds of something I wanted to ask you. I think rewarding a check of one of the spartan kings is not a good idea. It seems it is too easy to give a check (spartans having two kings and persians with many long-rangers) an...
by Evert
Fri Feb 04, 2011 7:14 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Getting ready for Thermopylae
Replies: 56
Views: 6469

Re: Getting ready for Thermopylae

I did not look at the games, but the last version of Sjaak did not seem to do much worse than earlier versions. No, I didn't have the impression it was doing too badly at Spartan either, but that impression was based on playing an earlier version of the same program. Two days ago I ran two normal c...
by Evert
Fri Feb 04, 2011 6:46 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Getting ready for Thermopylae
Replies: 56
Views: 6469

Re: Getting ready for Thermopylae

I have tested all engines we have now to my satisfaction, so I wanted to start the official Spartan Chess tournament (Thermopylae 2011) soon. What's the timescale for "soon"? It seems that some of the participants are in need of some debugging. That may include Sjaak, which for some reason is now r...