I downloaded all 27 million Go games from online-go.com, aka OGS, with permission. They are available on Internet Archive or here as SGF files or JSON. You can use them for whatever you like.
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archiving art backup blog book review cooking crafts dead tree debian electronics email game game design games go hack-a-day hacks hardware linux minecraft music november organization physical piskell pixel art programming publishing recipe research review self-improvement software storage system administration throwaway timelog video video game video games website websites wikipedia yearly review zorchpad