[Variant "From Position"] [FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w - - 0 0"] [Title ""] 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 Ng4!?
What I know is that Kasparov popularized the variant (around 1998 according to LiChess). But then, it came on the board already in Wahls-Reddmann (Hamburg ch 1987). I have no megabases to check but I'm fairly sure that I haven't "invented" Ng4. Can somebody look up the first occurence in some megabase? (Very obviously, this doesn't exclude some "patzer" playing it before even that "accidentally" and not getting credit because megabases concentrate on GMs, but so there.)