Author: Rafael Andrist
Date: 11:23:44 10/18/01
Go up one level in this thread
On October 18, 2001 at 14:20:39, Dann Corbit wrote: >On October 18, 2001 at 10:47:50, Rafael Andrist wrote: > >>On October 18, 2001 at 08:51:56, Robert Hyatt wrote: >> >>>On October 17, 2001 at 17:49:39, Robert Hyatt wrote: >>> >>>>On October 17, 2001 at 13:05:35, Roy Eassa wrote: >>>> >>>>>On October 17, 2001 at 13:02:34, Robert Hyatt wrote: >>>>> >>>>>>On October 17, 2001 at 11:15:12, Robert Hyatt wrote: >>>>>> >>>>>>>definitely a bug of some sort... >>>>>> >>>>>>A pretty simple bug in fact. I just fixed it in the 18.12 source and >>>>>>re-copied the source to the ftp machine. If you want to try the fix, >>>>>>feel free. There was a bad calculation that failed when the king was within >>>>>>one square of the rook-file promotion square, and the pawn was within one square >>>>>>of the promotion square, and the pawn was to move first... >>>>> >>>>> >>>>>Was the bug only in 18.12, or was it also in previous versions? >>>> >>>> >>>>Been there a while... Nothing has been changed here for several versions. I >>>>am completely rewriting the EvaluateDraws() code and have changed the name to >>>>EvaluateWinner(). It returns a bitmask of two bits, 01 means white can win >>>>only, 10 means black can win only, 11 means either can win, and 00 means dead >>>>drawn. >>>> >>>>It also recognizes a few more cases. I temporarily deleted the 18.12 source >>>>as I want to fix this completely as part of the final 18.12 release. I hope to >>>>finish it tonight... >>> >>> >>>New version is now available. It at least handles the test position for this >>>thread correctly. The search is more "stable" in the endgame as well, now. >> >>Did you include this KBP-KP case or did you only fix the bug in the evaluation >>of KBP-K endgames? Do you also handle cases, where the defending king is near >>enough, but can be forced to go away? E.g. >> >>[D]5k2/8/3K3P/8/8/8/2B5/8 w - - 0 1 > >EPD Kit revision date: 1996.04.21 >unable to open book file [e:\crafty\release/books.bin]. >hash table memory = 192M bytes. >pawn hash table memory = 80M bytes. >EGTB cache memory = 32M bytes. >draw score set to 0.00 pawns. >choose from book moves randomly (using weights.) >choose from 5 best moves. >book learning enabled >result learning enabled >position learning enabled >threshold set to 9 pawns. >5 piece tablebase files found >19045kb of RAM used for TB indices and decompression tables > >Crafty v18.12 > >White(1): st 60 >search time set to 60.00. >White(1): setboard 5k2/8/3K3P/8/8/8/2B5/8 w - - >1. Bb3 Ke8 2. h7 Kd8 3. h8=Q# >White(1): What do you want to say? It's clear that it is very easy using EGTB. Rafael B. Andrist
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