Author: Slater Wold
Date: 21:42:56 03/06/02
Go up one level in this thread
On March 06, 2002 at 23:40:28, Robert Hyatt wrote: >On March 06, 2002 at 22:49:38, Slater Wold wrote: > >>On March 06, 2002 at 22:27:17, Uri Blass wrote: >> >>>On March 06, 2002 at 19:18:16, Slater Wold wrote: >>> >>>>Hyatt said in an earlier post that TB's don't take into account the ability to >>>>castle because it would be a waste. >>>> >>>>However, when I feed this position into any engine, it solves it in 0.00 as a TB >>>>win. >>>> >>>>[D]5Q1Q/5Q1Q/5Q1Q/5Q1Q/8/6P1/6k1/4KR1R w K - >>> >>>Your FEN is wrong and we need to imagine that all the white queens that you >>>copied from dann corbit's post are missing. >> >> >>You're right. But obviously this is not the position I am talking about, >>because I don't have the 13 man TB's. :) >> >> >>>>It shows 20 possible moves, all from TB's I am guessing. >>>> >>>>I cannot cut and paste the eval, because there isn't one, but I have: >>><snipped> >>>>1.+ - (#4) Rf4 >>> >>>This is not correct and the program that you use has bugs. >>>It should not call tablebases in a position that is not in the >>>tablebases(castling is legal) >>> >>> >_Several_ of these moves take castling into accout. >>>> >>>>After Rf4 Kxg3 my TB's show 28 moves. The first move is 1. + - (#2) O-O, the >>>>last is 28. + - (#15) Rh8. >>>> >>>>I am 100% sure TB's do indeed take castling into consideration. >>> >>> >>>No >>>You do not understand how tablebases work. >>>There are no moves in tablebases. >>> >>>The engine generates all the legal moves and looks in the tablebases after these >>>moves to see distance to mate. >> >> >>Um, well, according to Hyatt, it would tell the TB "o-o" and it wouldn't return >>anything. I am very well aware how TB's work. > >Not quite. First I _never_ said anything like that. With EGTB's you don't >give them a move, and get back a score, you give them a _position_ and you get >back a score. And the score says "mate in N from the given position, >assuming castling is impossible." > > > >> >> >>>If castling is legal then the engine looks at the tablebases to see the distance >>>to mate after castling in order to see the mate in 2 score. >> >> >>According to Hyatt, no it doesn't. > > >You are greatly twisting things around. Re-read what Uri wrote... > >"if castling is legal then the engine only checks the TB _after_ castling >has been done." Because after castling has been done, it can't be done again >and the resulting EGTB score will be correct. Prior to castling, the score >will be wrong because castling is possible but the EGTB scores don't include >castling. > > > > >> >> >>>Uri >> >>The correct position is: >> >>[D]8/8/8/8/8/6P1/6k1/4KR1R w K - >> >>Sorry. I am not trying to "twist" anything around. You said TB's don't take into account castling. Ok, fine. I believe you. I open a chess engine, and it's returning o-o as a TB move. NO EVAL NEEDED. I am asking a simple question. Why?! How is an engine returning a mate, without TB's, without an eval? If it's a stupid question, I apologize. I just don't understand, obviously.
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