context: 1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... g8f6  4. d2d3  4... h7h6 A flexible move that keeps several plans open: he can play g7-g5 and Bg7, a bold idea that became popular a few years ago; or play g6-Bg7; or simply develop the bishop on its natural square, c5, without White being able to play Bc1-g5. 5. c2c3  5... f8c5  6. b2b4  6... c5e7  7. a2a4 