Author: Jan Pernicka
Date: 06:54:23 03/22/00
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On March 22, 2000 at 08:32:37, Inmann Werner wrote: >On March 22, 2000 at 08:05:13, Jan Pernicka wrote: > >>On March 22, 2000 at 07:12:59, Inmann Werner wrote: >> >>>On March 22, 2000 at 06:30:58, Jan Pernicka wrote: >>> > >All the following is only, what I do. (InmiChess) >It sure could be done better, but also more bad...(IMHO) Can I see somewhere on WWW (this abbr. I know!) more information about your program (games played, benchmarks...)? > >- All Extensions together in one branch are not allowed to exceed 9 ext. (seems >good with actiual search depths...) >- I make check extensions always, if distance to quietsearch is less than 7 . So - what's maximum searching depth of your program (say, in middle game) ? >- taking back a piece without changing material balance is a ext, if it is at >the last two plies before quiet search. question: does "take back" mean - to capture the piece of the same value or - to capture the piece on the same field or something other? >- if a pawn gets to line 7 at the horizon, I extend (and only then!) I can imagine the explosion when omitting the condition in brackets... >- promotions are in the quiet search >- if in check, also in quiet I allow all moves to get out >- if in check, and only one move leads out I extend. when I return to the first point (chess extension always when less then 7 plies to horizon...) - does this point mean that in this case you use ext. also higher in the tree? >- null move extension, i only allow once in a branch (it blows up the tree too >much) - this surprised me - I think that null move ext. shout shorten the time of search. (In other words - you have experienced that null-move ext. fails too often - and thus regular research has to be done?) >- I only extend once in one depth, never twice! But i remember the extensions >for deeper down. Why do you remember it when you don't extend ( statistics? :) ) >- my quiet search is no own routine. it is within my normal search, own >movegenerator and some ifs (although ifs are bad at the new computers, but small >code is good for cache hits..) This seems me good. If my premise is true - and you are from Germany - then we are neighbours - I'm from Czech... Thank you once again Jan Pernicka
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