Author: Uri Blass
Date: 02:43:41 08/30/01
Go up one level in this thread
On August 30, 2001 at 05:28:14, Gian-Carlo Pascutto wrote: >On August 29, 2001 at 23:10:56, Robert Hyatt wrote: > >>The "weights" don't always reveal what they stand for. I've had the DT >>code for at least 2 years. It isn't new. But I can give you the weights I >>use in Crafty and they don't tell you _what_ I am actually doing with them, >>only the numbers I am using. Their bishop of opposite color + pawn ending >>evaluation was _very_ good. Once Hsu explained it to me at an ACM event. >>You won't find that explanation of how it works in the stuff you reference. >> >>Which is a shame, actually. There's a lot in the thing that we won't ever >>know in great detail. > >The code includes the full eval itself. You can check it out and see >how they did kingsafety, bad bishops, passed and blocked pawns, etc... > >The tuner has that code because it is useless without it. You can't >tune an eval if you haven't got any. > >What I don't see is the endgame stuff you talk about. I see two possible >explanations: > >a) they thought it was so great that it shouldnt leak out and carefully >removed all references from it from the tuner > >b) they simply didnt _have_ it yet at the 1988 US Open. Perhaps it was >added afterwards in DT, DT2 or DB, and you are confused about when they >talked about it to you or implemented it. > >Make your pick. > >I think what the code shows is that in the 1988 US Open, Deep Thought >did not have great sophisticated evaluation. An ok one yes, but it's >certainly been surpassed by the micros in the meantime. > >Which doesn't mean anything about the evaluation of DT after 1988 or >of its succesors, but I find it awkward to be making much fuss about >DT's supposed evaluation if you can _look_ at it and see what they >did and did not do. > >-- >GCP I remember that I read that Deep thought lost a match 2.5-1.5 against bent larsen(I am not sure if it was in 1992 or 1993) and I read that deep thought could probably win by trading queens because the opposite color bishop endgame when deep thought has 2 passed pawns is not a draw. Deep thought did not know about it at that time and I remember that they admitted that they need good chess players with knowledge about chess to help them. Uri
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