1. g1f3  1... d7d5  2. g2g3  2... g8f6  3. f1g2  3... g7g6  4. c2c4  4... d5c4  5. d1a4  5... f6d7  6. h2h4 It's no wonder that capturing on c4 immediately is the most popular move, but there's nothing terribly wrong with the optimistic and thematic h-pawn advance. 6... b8c6 Now Black is threatening Nb6, so the pawn has to be taken.