Author: Slater Wold
Date: 21:47:00 03/06/02
Go up one level in this thread
On March 06, 2002 at 23:43:10, Robert Hyatt wrote: >On March 06, 2002 at 20:16:58, Dann Corbit 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 - >>> >>>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: >>> >>>1.+ - (#4) Rf4 >>>2.+ - (#4) Kd1 >>>3.+ - (#4) Kd2 >>>4.+ - (#4) Ke2 >>>5.+ - (#4) Rf5 >>>6.+ - (#4) Rf6 >>>7.+ - (#4) Rf7 >>>8.+ - (#4) Rf8 >>>9.+ - (#4) Rhg1+ >>>10.+ - (#4) Rh4 >>>11.+ - (#4) Rh5 >>>12.+ - (#4) Rh6 >>>13.+ - (#4) Rh7 >>>14.+ - (#4) Rh8 >>>15.+ - (#5) g4 >>>16.+ - (#5) Rh2+ >>>17.+ - (#6) Rfg1+ >>>18.+ - (#5) Rf2+ >>>19.+ - (#10) Rh3 >>>20.+ - (#11) Rf3 >>> >>>_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. >> >>That's right. They do. Crafty doesn't care, though. > > >NO. The EGTBs do _not_ consider castling. The tables are built without ever >considering the possibility of one side castling. Which means that if the >EGTB probe looks up a position with castling possible, it will get a score >back that assumes castling is _illegal_ since it doesn't ever include castling >moves during the EGTB generation phase... That's what I don't understand Bob. Why are the TB's returning + - (#2) O-O if it never takes into account castling? There is NO eval with this. Just straight TB. But according to you, it cannot, and I am sitting here looking at it! It does _NOT_ happen in Crafty, you are correct. Crafty DOES show an eval, even under the CB interface. I am talking about other engines. Shredder, Frtiz, Junior, etc. Perhaps they handle TB's differently.
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