Search found 2909 matches

by Evert
Sun Apr 26, 2020 2:02 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Estimating piece strength
Replies: 5
Views: 1411

Re: Estimating piece strength

This has been discussed a couple of times here. Look up posts by HGM on the topic (use the forum search). The short form is this: for sliders it is hard to derive an empirical expression based on the move set because they can be blocked and so have highly variable mobility. Part of their value comes...
by Evert
Sat Apr 25, 2020 6:46 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Some Chess960/FRC positions to be confirmed
Replies: 13
Views: 4985

Re: Some Chess960/FRC positions to be confirmed

SjaakII can do that. “Perft 6 1” does a distributed perft to depth 6 and outputs node counts for every move at ply 1.
by Evert
Sat Apr 25, 2020 6:19 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Some Chess960/FRC positions to be confirmed
Replies: 13
Views: 4985

Re: Some Chess960/FRC positions to be confirmed

Try a distributed perft, where you see the node counts for each node at ply 1. Then, make the move for which the node counts are off and repeat until you get to a position where you’re off at depth 1.
by Evert
Sat Apr 25, 2020 5:32 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Shuffling Pieces
Replies: 2
Views: 877

Re: Shuffling Pieces

You need to add an evaluation term so the program can see progress. Programs start shuffling pieces if the evaluation is stuck in a local optimum. The program tries to maximise its score by staying close to this position. A trick that may help is to drag the score closer to 0 as the half-move clock ...
by Evert
Fri Feb 28, 2020 6:24 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Assumptions about King movement which hold under new rule sets
Replies: 2
Views: 859

Re: Assumptions about King movement which hold under new rule sets

Well, let’s consider both logically. If a move delivers check, there are three things to check: 1. Does the evacuation of the from square expose a checking piece (which includes gated pieces, I suppose)? 2. Does the moving piece deliver a direct check? 3. Does the occupation of the target square act...
by Evert
Fri Dec 13, 2019 8:57 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Real Ancient Chess from Bharat
Replies: 92
Views: 11044

Re: Real Ancient Chess from Bharat

Wait, I’m confused.
Are you talking about a proper historical variant? Or are you talking about a game you invented?
by Evert
Fri Jun 28, 2019 9:29 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Linux flavors - opinions
Replies: 29
Views: 7730

Re: Linux flavors - opinions

I used Gentoo for a long time. It’s neat, portage is a great package manager and you do get to tweak everything. Keeping the ststem up to date became a bit of a chore though (you can mostly put it on a cron job, but still...) and updating outdated systems isn’t a thing. Switching to a new version of...
by Evert
Sun Jun 23, 2019 11:42 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: FRC / Chess960 -- Some Lessons I Learned
Replies: 34
Views: 11524

Re: FRC / Chess960 -- Some Lessons I Learned

An advantage of KxR is that you don’t have to look for the rook, since its location is right there in the move. It’s a reasonably elegant solution if this is the only really weird move you have to deal with (of course you also have en-passant and promotionsto consider).
by Evert
Fri Jun 21, 2019 5:17 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: DTM50
Replies: 65
Views: 19639

Re: DTM50

After noobpawnftw told me that dtm50 is not perfect. [...] DTM50 is both bulky and troublesome compared to DTM. What exactly is "not perfect" and "troublesome" with DTM50? DTZ50 may be perfect in theory, but it suffers from a laughable practical quirk. Look at Diagram 4 below. 2k5/8/K7/7p/7N/8/3Q4/...
by Evert
Thu May 09, 2019 9:08 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: catastrophic forgetting
Replies: 5
Views: 2393

Re: catastrophic forgetting

I think this is a really interesting project, with a lot of potential. Also sadly one that I lack the time and resources to look into myself.
I’ll be very interested to hear about your results.