1. d2d4  1... g8f6  2. g1f3  2... d7d5  3. c1f4  3... e7e6  4. e2e3  4... f8d6  5. b1d2  5... b7b6  6. f4g3  6... e8g8  7. f1d3  7... c8a6  The swap of the light-squared bishops is one of the safest ideas against  the London.