A sideline.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... f8c5  4. c2c3  4... g8f6  5. d2d4 A topical alternative to the Giuoco Pianissimo that arises after 5.d3. 5... e5d4  6. e4e5  6... d7d5 