Author: Robert Hyatt
Date: 10:39:17 04/30/02
Go up one level in this thread
On April 30, 2002 at 12:21:13, Joe McCarro wrote: >On April 29, 2002 at 21:35:15, Robert Hyatt wrote: > >>On April 29, 2002 at 18:12:17, Keith Ian Price wrote: >> >>>On April 29, 2002 at 15:49:23, Robert Hyatt wrote: >>> >>>>On April 29, 2002 at 14:01:23, Joe McCarro wrote: >>>> >>>>>If I were playing someone over the board and they seemed to give me a >>>>>possibility to play Bxa1 snatching the rook I would think long and hard before >>>>>doing that. I'd figure as long as this isn't a trap I will win the game. Let me >>>>>take my time to just make sure its not a trap. I wonder if this couldn't be >>>>>programmed in. Anytime the other player makes what on the surface appears to be >>>>>a blunder (e.g., drops over a pawn) the computer could spend extra time working >>>>>out the position before moving. If it ended up it was in fact just a blunder >>>>>presumably the computer should still be able to win despite the extra time spent >>>>>looking for the tactical shot. If it found it wan't a blunder the computer >>>>>might avoid taking the poison. Do the programmers do anything like this? Would >>>>>this in fact be helpful or would it have disadvantages as well? >>>> >>>> >>>>There are two choices here: >>>> >>>>1. They made a blunder hanging the rook. >>>> >>>>2. after due consideration your opponent decided that either the rook could >>>>not be saved, or it could not be captured without exposing you to lots of >>>>difficulties. >>>> >>>>In choosing which of the above is true, you would need to know your opponent >>>>and his FIDE/whatever chess rating... >>> >>>Not really. If your opponent were a Patzer the extra time won't hurt. Your >>>program will still beat him. If he were a GM, you could assume case number two, >>>and it would be wise to take a longer look. So the choice that benefits either >>>way is to take a longer look. The question is--How much longer? >>> >>>kp >> >> >>None unless the score is dropping steadily. Then you might have a problem. > >Does the score always drop steadily or does it sometimes drop quickly once >somethign is seen? >BTW thanks for all the great responses. It seems Steffen Jakob has been >employing the reasoning I suggest one of his programs. It happens _both_ ways. Sometimes it takes a specific depth to see the roof fall in and give you a chance to change to another move. Other times it just gets worse and worse as your engine goes deeper and deeper, because it is slowly seeing "the truth" bit by bit.. The first case is easier to handle, the latter is not. DB had something cute in it to detect the latter case better than I ever did and think longer even when it wasn't apparent that something bad was happening right at that instant...
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