Author: Robert Hyatt
Date: 08:14:00 02/24/04
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On February 24, 2004 at 09:27:26, martin fierz wrote: >On February 23, 2004 at 11:14:28, Robert Hyatt wrote: > >>On February 23, 2004 at 07:02:59, martin fierz wrote: >> >>>aloha, >>> >>>i have a question about pins. pins are a rather important feature in chess; some >>>of them are not so bad, some are deadly. i just happened to chat briefly with >>>anthony cozzie on ICC, and he said he didn't do any pin detection. i detect >>>pins, but i don't evaluate whether a pin is not so bad or deadly. my questions >>>are: >>>-> are you detecting pins in your program? >>>-> if yes, do you try to distinguish between different pins? >> >>No and No. I don't do it as I have not found it very important. IE with the >>depth I hit today, if a pin is important, the search can go deeply enough to >>discover this without much trouble. 20 years ago I was definitely evaluating >>pins, as hitting 5-6-7 plies is not deep enough to see the consequences of a >>pin, whereas todays 12-16 plies in longer games is more than enough in most >>cases. > >interesting - and a possible explanation why i believe i need them. muse >searches something like 1-2 plies less than crafty on equal hardware (meaning >single-processor hardware of course...), and i play blitz matches. so i'm >getting something in between of your 5-7 and 12-16 plies; meaning that i am >closer to needing pin detection than you are :-) > >cheers > martin You are also in the danger-zone for null-move R=2 and R=3 as well, at those depths. If you look at the comments in main.c in Crafty, you will see how many times I tried R=2 from 1994 to date, and how many times it failed, until the depth reached a point where null-move didn't hide too many tactics... Depth is definitely part of the formula, and the deeper we go, the more things change in unexpected ways... > >>There are exceptions, but the question has to be "is the cost of doing this >>offset by the playing strength increase?" I believe that at least for my >>program, the answer is "no". >> >>YMMV of course. >> >>> >>>cheers >>> martin
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