On the board we have a typical pawn structure of the King's Indian Attack. Black has not castled yet, so he can take the opportunity to attack the e5-pawn and advance the kingside, perhaps placing the king on the other side of the board.
1. g1f3  1... g8f6  2. g2g3  2... b7b6  3. f1g2  3... c8b7  4. e1g1  4... c7c5  5. d2d3  5... d7d5  6. e2e4 [%c_effect e4;square;e4;type;GreatFind;persistent;true] A thematic move and the best way to fight for an advantage. White doesn't need to wait for the e4-square to be protected, as it's possible to exploit the h1-a8 diagonal. 6... e7e6 It's better for Black to maintain the center. 7. e4e5  7... f6d7  8. f1e1 