Search found 274 matches

by zenpawn
Wed Aug 17, 2016 8:49 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: perpetual check position
Replies: 27
Views: 3210

Re: perpetual check position

Including checks in qsearch is a bit different, here you make the search wider by adding more moves to be searched (quiet checks), but you only do that during the first N plies of qsearch, typically N=1. This will basically extend the horizon at some leaf nodes. But the kind of extension is not the...
by zenpawn
Wed Aug 17, 2016 8:16 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: perpetual check position
Replies: 27
Views: 3210

Re: perpetual check position

Thank you all for such a lively discussion, feedback, more test positions, and encouragement. You've definitely made me feel welcome. :)

Regarding check extensions, it basically accomplishes the same goal to include checks in qsearch, right?

-Erin
by zenpawn
Tue Aug 16, 2016 10:06 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: perpetual check position
Replies: 27
Views: 3210

Re: perpetual check position

Thank you, Robert. It's an honor. I've experimented with check extensions, but am currently favoring just allowing them in q-search instead. Also, LMR is not allowed when checking or in check. I'm glad it's sufficiently long a variation to require 13 ply from Crafty (is that the mathematical minimum...
by zenpawn
Tue Aug 16, 2016 9:24 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: perpetual check position
Replies: 27
Views: 3210

perpetual check position

Hi all, This is my first post, having become hooked in late May to this addictive hobby. I now have a frustratingly-weak (~1800-1900 at 2+6 or 40/4 TC) chess engine all my own . :) I forget where I got this position. It was an example of perpetual check/three-fold repetition when white is to move, w...