It has been a  long time since I've seen this line. Actually, the last time I remember a  top player using it, Magnus Carlsen tried it as White!
1. e2e4  1... c7c5  2. g1f3  2... d7d6  3. d2d4  3... c5d4  4. f3d4  4... g8f6  5. b1c3  5... a7a6 