SGF(2) has a place to specify the ruleset, according to
http://www.red-bean.com/sgf/properties.html:

*Property:*     RU*Propvalue:*  simpletext
<http://www.red-bean.com/sgf/sgf4.html#simpletext>*Propertytype:*       
game-info*Function:*    Provides
the used rules for this game.
                Because there are many different rules, SGF requires
                mandatory names only for a small set of well known rule sets.
                Note: it's beyond the scope of this specification to give an
                exact specification of these rule sets.
                Mandatory names for Go (GM[1]):
                        "AGA" (rules of the American Go Association)
                        "GOE" (the Ing rules of Goe)
                        "Japanese" (the Nihon-Kiin rule set)
                        "NZ" (New Zealand rules)


How can we specify the Chinese rules normally used in computer Go?

They're *almost* equivalent to AGA rules, but AGA uses situational superko
while Chinese uses positional superko. The difference would only come up
extremely rarely, potentially making for a nasty bug.

For those who don't know these terms:

http://senseis.xmp.net/?Superko

-- 
Peter Drake
https://sites.google.com/a/lclark.edu/drake/
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