Author: Martin Giepmans
Date: 03:34:29 08/10/01
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On August 09, 2001 at 12:38:58, Bruce Moreland wrote: >On August 09, 2001 at 06:12:52, Martin Giepmans wrote: >best move is, say, Nc3. Score +0.10. >> >>I think this proves your point: drawscores influence other (nonzero) scores. >>However, along path B white has obviously not played the best moves. >>If white gets 0.10 instead of 0.40 there must be something wrong with either 2. >>Nf3 or 1. d4 or both. >>So, my question is: does this influence of drawscores minimax downto the root of >>the tree? My first thougth was no, my last (thought 31) is: I really don't know >>... > >The answer is yes, as anyone who has seen the fail-high/fail-low effect in a >vanilla program with nothing special except hash tables can attest. > >This was the subject of one of my first r.g.c.c. posts, in 1994. > >bruce What is this? Are you getting irritated? Maybe I'm stubborn but to me it's not about who is right or wrong. I just want to be sure. And what anyone sees, well, 500 years ago anyone could see that the earth was flat ... What happens in a search is obviously very complicated. Alfabeta, hashing, pruning, etc, all these things interact. We try to find our way by a kind of fuzzy reasoning, mixed with questionable induction from experience. It's like in the early days of physics or statistics. People often got wrong results because they had no exact mathematics or controlled experimenting to rely on. In this situation we have to be very careful. Any conclusion might be wrong. Do you agree? About the weird thing in your vanilla: I've also seen it, but that was *before* I implemented detection of repetition. It disappeared when I disabled pruning ... You see, there is the doubt again ... Anyway, I understand I will see you in Maastricht, I wish you good luck but of course I hope I will mate you :) Martin
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