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It would be great if Wikipedia had info's on all the go pro's (with pictures) and tournaments. Not just the title holders, but also the other matches.
Would adding the sgf for tournament game be a problem? Single games aren't copyrightable so there shouldn't be a problem.
Would SL be a respectable enough source to reference to?
Charles Images on WP have to have completely transparent provenance. Basically, unless a picture is known to be in the public domain, or is taken by some person who uploads it and gives up the rights under the GFDL, WP can't easily use it.
I don't think SGFs have a good place in WP articles on go. There might be a case for placing them on Wikipedia Commons.
As far as referencing SL: in some cases, yes. Obviously for any controversial news, SL would not be reliable enough, since there is no policy on sources here.