What a curious move! Out of nowhere Black decides to advance the h-pawn instead of developing the pieces. Of course this is an exotic move and not the most popular in this position. In fact, it's only the seventh most played, quite a feat considering that Black doesn't have many moves available. The idea is to get the pawn to h4, but should White worry about that?
1. g1f3  1... g8f6  2. g2g3  2... c7c5  3. f1g2  3... b8c6  4. d2d4 This move is not a good attempt to gain an advantage. 4... c5d4  5. f3d4 