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Subject: Re: New terrible bug in patched CM 8000!

Author: John Merlino

Date: 18:36:38 04/08/01

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On April 08, 2001 at 17:40:45, Andreas St. wrote:

>On April 08, 2001 at 15:27:32, John Merlino wrote:
>
>>On April 08, 2001 at 07:47:01, Andreas St. wrote:
>>
>>>Hello,
>>>
>>>I found a new terrible bug in the patched (1.02) Chessmaster 8000. It concerns
>>>the recognition of move-transpositions in Chessmaster.
>>>I analysed this with an opening variant with the help of the Tournament Book
>>>from Mr Kostick:
>>>
>>>1.d4 d5 2.c4 c6 3.Nf3 Sf6 4.Nc3 dxc4 5.a4 Bf5 6.e3 * this is well known.
>>>
>>>CM 6000 is in book and plays e6. Thats normal. CM 8000 (patched) is out of book
>>>with the same opening book!!!
>>>Another example:
>>>
>>>1.Nf3 Nf6 2.d4 g6 3.c4 Bg7 4.Nc3 d5 5.Qb3 dxc4 6.Qxc4
>>>
>>>CM 6000 is in book and plays 0-0. CM 8000 is "out of book"!!!
>>>
>>>And now the Amazing: The UNPATCHED CM 8000 is NOT out of book in these both
>>>variants with the SAME book!!! SO it means, the patched CM 8000 has a new book.
>>>I also found some weeks ago the bug in the opening-Editor of CM 8000 AFTER
>>>patching, with makes the editor useless in practice. I told John Merlino about
>>>the bug in the editor.
>>>If this new bug is connected with the editor-bug, i dont know.
>>>But this new bug is very bad. It makes the bad opening books in CM 8000 more
>>>bad.
>>>
>>>I hope, John Merlino reads this and a new patch comes soon. CM 8000 need it!
>>>
>>>Greets
>>>
>>>AS
>>
>>One important question:
>>
>>Does this only happen with books created with the opening book editor, or does
>>it happen with ALL books (even those that came with the program)?
>>
>>jm
>
>
>Hello,
>
>I must look if i find moves in the original book. I will email you. But it looks
>like a bug....
>
>Greetings
>
>AS

I agree that it's probably a bug. The question is whether it is a bug in:

a) the code that detects transpositions in a book,
b) the code that imports PGN files into a book, or
c) the code that saves a book.

I'm guessing that it is either b) or c), meaning only user-created books will be
affected.

Let me know what you find,

jm



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