comment: This is probably the most reliable move.
context: 1. e2e4  1... c7c5  2. g1f3  2... e7e6  3. d2d4  3... c5d4  4. f3d4  4... b8c6  5. b1c3  5... d8c7  6. c1e3  6... a7a6  7. a2a3 A cunning way of meeting the Taimanov variation. It's much more dangerous than it looks and has been played many times by strong GMs.