Key ideas
- Black can try to keep the pawn with ...g5, or return it with an early ...d5 for easy development.
- White's king is exposed after f4, so the game is double-edged for both sides.
Plans for White
Develop fast, play d4, and aim your pieces at f7.
Plans for Black
Either hold the extra pawn with ...g5 and accept some risk, or give it back with ...d5 for a comfortable game.

