Black follows the same strategy.
1. c2c4  1... c7c5  2. b1c3  2... b8c6  3. e2e3  3... g8f6  4. d2d4  4... d7d5  5. g1f3  5... e7e6  6. a2a3 White decides not to resolve the central tension and makes a waiting move. This is the most-played move in this position.