Author: Robert Hyatt
Date: 20:40:28 03/06/02
Go up one level in this thread
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.
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