Author: martin fierz
Date: 06:27:26 02/24/04
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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 >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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