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Subject: Re: about the Thompson tables...

Author: Mike S.

Date: 06:39:52 05/27/03

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On May 27, 2003 at 01:40:05, Johan de Koning wrote:

>(...) Eg Thompsons CDs are still good (if copied to hard disk of
>course :-).

I have them on HD too (CD 1...4). Unfortunately, not only have bugs been found
in the data of the 4th CD - which you are aware of I guess - but recently also
in one of the tables which was included on CD 1...3.

I cannot find the example currently. If you are interested, I could ask Helmut
Conrady of CSS (who may also read this) for the position. As for the CD#4, it
wasn't tested the same way like the first 3 CDs, according to an information
provided by Ken Thompson himself.

My conclusion is, that - unfortunately - I cannot trust the Thompson table's
results to 100%.

Actually it isn't a big loss for me personally, because I have to admit I didn't
understand the concept of DTC very good. Sometimes I had difficulties to
interpret the output when it doesn't say "mate in...", i.e. if the Tables mean
37 moves to conversion: Is it *win*, or is it a *draw* after the conversion??
:-)) Also, I don't like that it makes a difference which side goes for the win,
to choose the correct table. Confusing...

Regards,
Mike Scheidl



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