Surprise, surprise

Proving that you can play almost anything in the opening today, Shakhriyar Mamedyarov caught Alexander Grischuk with a bizarre opening idea in the Ruy Lopez. I don't think I've ever seen g5 played so early by Black in this opening, although the actual move was first played in 1968 (by Portisch against Korchnoi).
There does not seem to be too much subtlety to the move btw, as Mamedyarov used the g pawn to push the knight of f3 before running his h pawn up the board as well. The whole game had a kind of 'coffee house hack' vibe to it, but I am sure I'm doing both players a disservice by describing it like that.

Grischuk,Alexander (2785) - Mamedyarov,Shakhriyar (2791) [C72]
21st European Teams Hersonissos GRE (8.1), 05.11.2017