An early g4 in a GM game

I did not recall having seen this before but the Lichess Masters db shows almost 170 entries with it, and the earliest of the top entries is from 1998, and this should be no surprise, played by none other than the creative GM Vadim Zvjaginsev, a student of the famous chess coach Mark Dvoretsky.

Let's have a look :

Then, after this win for white, I noticed that Jeroen Piket played it himself as white, the next year, in 1999 (Remember that Ulf Andersson played with black versus Bobby Fischer in 1970, and Ulf was so impressed by the Hedgehog (with b3 and c4 by Fischer as white) that he adopted it himself, and later went on to win with the Hedgehog versus Karpov. So, you cannot just learn from your losses, you can learn opening ideas from your opponent as well).