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Re: [Bug-gnubg] "Joseph-ID" in benchmark db

From: Philippe Michel
Subject: Re: [Bug-gnubg] "Joseph-ID" in benchmark db
Date: Thu, 9 Feb 2012 08:34:51 +0100 (CET)
User-agent: Alpine 2.00 (BSF 1167 2008-08-23)

On Thu, 9 Feb 2012, Mark Higgins wrote:

Can anyone point me to a function to convert the keys in the benchmark dbs to a 
board layout pls?

They don't look like 14-char position IDs, and checking this list archive I see 
them occasionally referred to as Joseph-ID.

The underlying binary key is the same but gnubg's position ID encodes it in base64 while Joseph uses a simpler encoding that translates only 4 bits per character.

See for instance http://cvs.savannah.gnu.org/viewvc/gnubg/gnubg/gnubg.c?r1=1.905&r2=1.906

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