Author: Dave Gomboc
Date: 06:19:33 06/08/99
Go up one level in this thread
On June 08, 1999 at 03:30:37, blass uri wrote: > >On June 08, 1999 at 00:47:02, Dave Gomboc wrote: > >>On June 07, 1999 at 21:22:45, Mike Castañuela wrote: >> >>>On June 07, 1999 at 19:08:42, Dave Gomboc wrote: >>> >>> >>> >>>>On June 07, 1999 at 16:41:56, Dann Corbit wrote: >>>> >>>>>On June 07, 1999 at 16:35:24, blass uri wrote: >>>>>[snip] >>>>>>In part of these 7% of the cases(including your 3 examples) underpromotion is >>>>>>needed only to win faster but is not important practically for the result of the >>>>>>game. >>>>>The same would be true of a program that takes a bishop to go up +3 instead of >>>>>taking a rook to go up +5. Which program would you rather have? >>>> >>>>The one that knows how to get to the position where it can win either way. >>>> >>>>Dave >>> >>>But if one way (that can be unique to the victory path) >>>of those all ways is not feasible, then what? >>>Too, underpromotions weigh in esthetic terms, not only practical. >> >>If? Well, then you miss the win. Tough one. But how realistic is this "if"? >>Not very. However, if accounting for underpromotions would slow down Junior by >>a few percent in every game it plays, that's not an "if", that's a definite >>relative penalty, in every single game. >> >>It's a chess engine. Aesthetics are for user interfaces, not engines. ;-) >> >>Dave > >I think that there is no reason to slow Junior down by a few percent to consider >underpromotion. > >You can use 0.1% of your time to compare between search with underpromotion and >without underpromotion and if there is a difference then to use an evaluation >function that allow underpromotions. > >In this case you lose less than 0.1% of your time and I believe that you play >slightly better. > >Uri You need to identify the need for underpromotion while the actual underpromotion is out at the leaf nodes. Otherwise you will choose a different variation and not require it. Checking for it only at the root isn't terribly useful in the context of playing a game. Dave
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