Is the text at http://www.red-bean.com/sgf/sgf4.html#ebnf-def correct?
It seems to me that
GameTree = "(" Sequence { GameTree } ")"
Is rather restrictive and should possibly be
GameTree = "(" Sequence { GameTree } [Sequence] ")"
Without a change like that, doing a local variation requires one of two
things:
1. Enclose the sequence after the variation in another set of parenthesis
(to make it a valid gameTree in its own right). This seems almost silly to
do.
2. Extend the local variation to the end of the game (this strategy could
lead to many closing parenthesis at the end of the file)
My preference is really to enclose local variations in parenthesis and then
continue on as normal. I'm ok with the spec as is, it just seems a bit
strange.
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