3gp — King Indian 12yars Work
Note: I interpret "3gp" as the chess opening move order 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 (the "3...g6"/Modern/Kings-Indian family) and "12 years work" as a long-term project or book/collection covering a dozen years of research and practice on the King's Indian. If you meant something else (a file format, video, or specific product), tell me and I'll adapt.
