Computer Chess Club Archives




Subject: Re: What approach do you use to handle castling/en passant for repetition?

Author: Eugene Nalimov

Date: 13:28:58 02/28/00

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On February 28, 2000 at 16:20:21, Tom Kerrigan wrote:

>On February 28, 2000 at 13:51:25, Robert Hyatt wrote:
>>Who isn't including EP status in the hash signature?  I can't imagine _anyone_
>>not doing this.  It leads to simple failures that are easy to predict.
>I'm not sure the authors would appreciate it if I started talking about their
>algorithms in an open forum like this. I'm sure you understand.
>As for knowingly adding bugs--well, duh. I don't expect you to keep the damn
>"bug" IN. And you yourself said it would be easy to prove your point. So do it.

I believe Bob already did it - he said that he lost the game because of not
storing EP bit in hash signature. For me that means that at least for one
program hashing EP bit makes a difference.

For other program that can matter less, of course - e.g. if you don't use hashed
score from the previous moves, error chances are decreasing.


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