1. e2e4  1... d7d6  2. d2d4  2... f7f5 This is not a popular option, of course. Advancing the f-pawn is one of the worst things Black can do in a defense against the king's pawn opening. But, surprisingly, it's not as bad as it looks. Let's not forget this is a rapid game—some liberties are allowed. 3. e4f5  3... c8f5  4. f1d3  4... d8d7 