Author: Robert Hyatt
Date: 19:55:14 03/17/01
Go up one level in this thread
On March 17, 2001 at 14:48:05, Chris Hull wrote: >On March 17, 2001 at 13:38:31, Uri Blass wrote: > >>On March 17, 2001 at 13:04:29, Antonio Senatore wrote: >> >>>It seems incredible that a top chess program like Junior 6 (without the KPPKB >>>tablebase but with the KBK and the KBKP tables) CAN'T SEE MATE IN ONE in the >>>next position: >>> >>>7k/4pK1p/7B/8/8/8/8/8 w - - >> >>It is not a bug >>It is a design decision by the programmer. > > >A bad design decision is even worse than a bug. A bad design is >almost always much harder to correct than a bug in the program. If you count the number of games this "bug" loses, vs the number of games it wins by letting the program avoid trading into an ending that is drawn 99.99999999% of the time, you might decide that this isn't a "bug" at all. It is a very reasonable way to handle a well-known problem. > > >>Junior knows that king bishop with not more material cannot mate and the same >>for king knight with no more material. >> >>It practically help Junior in games because Junior simply does not have to >>search in KB vs KPP positions unless it evaluates the position as advantage for >>the side with the pawns. >> >>I believe that you can change the default parameters if you prefer a weaker >>program that can see the mates in the position that you posted. >> >>Experience tells that they never or almost never happen in games so the >>programmer(Amir Ban) did not care about them. >> >>Uri > >Chris
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