Author: Bruce Moreland
Date: 10:18:59 09/23/99
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On September 23, 1999 at 10:04:46, Jaime V. wrote: >On September 23, 1999 at 01:16:16, Nicolas Carrasco wrote: > >>Hi, >> >>I had implemented MIN-MAX succesfuly and deleted the slow MIN-MAX and put Alpha >>Beta exactly as I have on a magazine I have bought called "Solo Programadores" >>Number 37. And as is on most sites. My MIN-MAX function finds me a move that my >>evalation function scores 20 and Alpha Beta other that scores 16. >> >>It is natural? >>I am doing something wrong? >> >>Thanks! >> >>PS: Don´t forget to visit my website that I completly changed yesterday. >> UruChess Official Web Site http://www.puntadeleste.to/uruchess/ > >Hello > >I think Alpha beta prunning only return values between Alpha Beta limits. The >lower value can be returned is Alpha. >Any value under the Alpha limit will be cut off. > >Is your alpha (beta) value 16 or similar? At this point he should be feeding in an initial window of -32767, +32767, assuming that all possibly eval values will fit between those two values. Alpha-beta is still efficient with a wide window and it should be impossible for it to return a value that's not the same as min-max. Alpha-beta can affect a finished chess program, but that's because of forward pruning, mistaken pruning due to hash table elements, and the like. bruce
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