Author: Larry Griffiths
Date: 21:21:34 09/05/00
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On September 05, 2000 at 14:30:13, Steve Coladonato wrote: >On September 05, 2000 at 13:03:52, Larry Griffiths wrote: > >>I have been running the BWTC (Brilliant Ways to Checkmate) tests. >> >>I downloaded 2 different versions of BWTC with different dates. The suite with >>an earlier date seems to be fixed up better that the one with a later date. >> >>I noticed that some positions have more than 1 best move. The fixed up version >>has some of these multiple best moves like "bm Ra1 Qe4". >> >>At about test 930 in BWTC there are several positions that can have 7 or 8 best >>moves but they are not in the test suite I am using. >> >>Is there a limit to how many bestmoves can follow the "bm". >> >>If not, does anybody know where I can get a really clean version of BWTC? >> >>Larry. > >I don't have the answer Larry is looking for but I would appreciate a >clarification on "bm" vs. "pv". It is my understanding that what follows "bm" >is a list of candidate "best moves" for the position. All moves in the list to >be made by either white or black (whichever side it is to move in the position). > And that what follows "pv" is the "principal variation" from the position with >moves for both white and black. > >In the case of "bm" in the EPD, is an evaluation, "ce", appropriate or is an >evaluation only appropriate for "pv". Also, can "bm" and "pv" both be in the >EPD for a position? > >Steve It gets worse Steve, I have the 1001 Brilliant Ways to Checkmate copyright 1955. It does not say when it was printed. I spent the last hour trying to find a bug in my program that did not exist. The book shows mate in 6 but my program kept showing mate in 7. Both started out with Bxf6. My program shows a delaying knight check to delay the checkmate. The bishop was taking my rook and then my Queen took the bishop. I thought this was stupid as the Queen had mate in the next move. I spent an hour trying to find out why the Queen would not mate the King. Then I looked at the position and saw the bishop was checking my King so the Queen had to take the bishop after all. Very frustrating! I wonder is there is a newer version of the BWTC book. I think I have had mine for over 10 years now. Larry.
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