Author: Uri Blass
Date: 15:10:59 07/16/02
Go up one level in this thread
On July 16, 2002 at 17:44:36, Robert Hyatt wrote: >On July 16, 2002 at 17:38:02, Uri Blass wrote: > >>On July 16, 2002 at 16:52:33, Robert Hyatt wrote: >> >>>On July 16, 2002 at 14:32:57, Russell Reagan wrote: >>> >>>>On July 16, 2002 at 11:07:10, Robert Hyatt wrote: >>>> >>>>>However, with _no_ book you leave yourself open for preparation of traps. I >>>>>saw Ken Thompson do this to NuChess years ago at an ACM event. You don't want >>>>>to leave that kind of "hole" for a major event... >>>> >>>>Was it a trap set specifically for that engine? Or was it just a general trap >>>>that many engines fall for when left on their own? >>>> >>>>Russell >>> >>> >>>Sort of both. >>> >>>1. Ken knew which opening Nuchess would play, as ken was white and they >>>had a pretty narrow book. He simply added a line that made them go out of >>>book pretty early, with a classic trap where they gave up a piece to win >>>the rook at a1, and thought they were winning an exchange and losing a pawn. >>>In reality, they lost both pieces plus the pawn, and the game. >> >>It is not going to work against Movei even in bullet. >> >>Movei evaluates black knight at a1 as clearly less than a knight in normal >>squares and the difference in evaluation is slightly more than a pawn. > >Look out on ICC. Would you rather lose a pawn or be forced to place your >knight on A1/H1 for a while? I would prefer to stick the knight on the >corner, because that can be corrected later. Losing the pawn is losing the >pawn, period. You can't make it come back later. There are often cases when the black knight cannot come out of a1 later. I prefer to lose a pawn for a probability of 40% to win the knight and I suspect that it is more than 40%. If the knight is not trapped there is a good chance that the search can get it out of the corner and it is easier relative to the case that the knight is trapped because if it is trapped you may need many moves to capture it and in most of the cases when it is not trapped you can get it out of the corner in one move. I also saw games when Movei beated other programs because the knight of the opponent was trapped in the corner. I think that these cases are more common then the cases when Movei is losing games because it evaluates the corner too much. Uri
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