All (27 million) Go games, downloaded from online-go.com (aka OGS) and redistributed with permission. They may be useful for archiving, artificial intelligence training, or Go research.

• Internet Archive mirror in case downloads are slow
• README has everything you need to know
• SGF files, one per game. SGF is a format viewable by most Go computer programs.
  • Almost all OGS games organized chronologically, aka by date played (6.2GB download, 44 GB uncompressed)
  • Almost all OGS games organized by username (11 GB download, 88GB uncompressed)
  • OGS tournament/uploaded games (0.13 GB download, 0.6 GB uncompressed). Some games were uploaded as SGFs to OGS, so I just provide them here unchanged. It looks like most such games are professional matches or amateur tournaments. They are organized by date played, beginning in the 1600s.
• JSON file, single file for the whole collection
  • JSON file of Go games (19 GB download, 82GB uncompressed)
  • A sample JSON file with 1,000 (0.0008 GB download, 0.003 GB uncompressed) or 100,000 (0.08 GB download, 0.3 GB uncompressed) randomly chosen games.
• Crawling and SGF extraction source code