Search found 2903 matches

by Evert
Wed Feb 16, 2011 5:53 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: LVA MVV with relative Pin
Replies: 8
Views: 1977

Re: LVA MVV with relative Pin

It needed 50 Seconds to find a somewhat 'playable' move (from my engine's limited 8-ply point of view: Nfd5 - but strong engines can refute this) - which is a lot longer than usual. That may not be too bad, in a somewhat complicated position. Jazz switches to Qa4 at 6 ply and f3 at 14 ply, but alwa...
by Evert
Wed Feb 16, 2011 4:32 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Attack and mobility evaluation in chess variants
Replies: 7
Views: 1487

Re: Attack and mobility evaluation in chess variants

But I have always had the feeling captures in normal Chess should not be counted as mobility. If they are good captures, it doesn't really matter if you count them or not, because the current evaluation will not determine the score of the node, but the capture will. If they are bad, they aren't rea...
by Evert
Wed Feb 16, 2011 2:49 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Spartan chess perft?
Replies: 3
Views: 741

Re: Spartan chess perft?

These are the perft results from the opening position from Sjaak. It's fairly easy to make it output perfts for any position, so if you want more, just let me know. 1 20 0.00 540540.54nps 2 640 0.00 3422459.89nps 3 14244 0.00 5859317.15nps 4 473282 0.10 4653295.19nps 5 11712515 1.94 6026986.97nps 6 ...
by Evert
Tue Feb 15, 2011 7:44 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Attack and mobility evaluation in chess variants
Replies: 7
Views: 1487

Attack and mobility evaluation in chess variants

I'm working on improving the evaluation function for my chess variant engine (mostly bugfixes at the moment, of which there are more than I would have hoped). One of the things I was playing around with is the mobility/king safety evaluation. The king safety is a generalised form of Ed Schroder's al...
by Evert
Tue Feb 15, 2011 3:59 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: frcperft released
Replies: 8
Views: 1574

Re: frcperft released

Daniel Shawul wrote:I don't like bulk counting because it doesn't reflect what actually happens in a real search.
Same reason I don't.
Sorry Allard for hijacking your thread. :oops:
It's ok, he can re-use it to post about his new Spartan chess engine. ;)
by Evert
Tue Feb 15, 2011 2:03 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: frcperft released
Replies: 8
Views: 1574

Re: frcperft released

Please excuse my shameless request below. Could you add also a perft for spartan chess ? :) Sjaak has a perfter for Spartan, if you want it. It's not particularly optimised for it though, doing more work than it needs to for terminal nodes. It uses the same method as PERFT_SLOW in the frcperft prog...
by Evert
Sun Feb 13, 2011 10:47 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Thermopylay Marathon 2011 (live!)
Replies: 69
Views: 4123

Re: Thermopylay Marathon 2011 - Final Standings

Well, the point in the playoffs was totally undeserved. Spartacus was at +6.5 (which reproduces), and then at +8.5 (which reproduces, but through another move), and then it started to play ridiculous blunders, first throwing away his lethal passed Hoplite with an imagined +12 score, then sacking it...
by Evert
Sat Feb 12, 2011 1:46 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Thermopylay Marathon 2011 (live!)
Replies: 69
Views: 4123

Re: Thermopylay Marathon 2011 - Final Standings

I am sure there is many evaluation stuff that we didn't implement or got wrong. Also even looking at some human games he played is interesting i.e if he has them in pgn :) He has some pointers on his website for strategy that I've kept in mind while writing the evaluation function (without explicit...
by Evert
Sat Feb 12, 2011 1:44 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Thermopylay Marathon 2011 (live!)
Replies: 69
Views: 4123

Re: Thermopylay Marathon 2011 - Final Standings

Sometimes a significant change in performance aganst a sngle engine can simply be caused by sudden preference for a strategically poor opening line. I guess I really should make some sort of GUI book for Spartan Chess, or a test set like Nunn. Perhaps I should ask Steven Streetman, who invented Spa...
by Evert
Sat Feb 12, 2011 1:40 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Thermopylay Marathon 2011 (live!)
Replies: 69
Views: 4123

Re: Thermopylay Marathon 2011 - Final Standings

Thanks a lot for a very good tournament. I hope there is another one coming because this has been the only tournament I was actively following since some time. Hear, hear! (Not that I tend to follow tournaments very much) Though disappointed on the way Nebiyu lost, it has uncovered lots of things t...