This position has been played many times. Black is very solid, and the pawn on a6, which might have seemed like a waste of time when it was played on the third move, ends up being useful against the typical minority attack with b4-a4-b5.
1. d2d4  1... d7d5  2. c2c4  2... e7e6  3. b1c3  3... a7a6  4. c4d5  4... e6d5  5. g1f3  5... g8f6  6. c1g5  6... c8e6  7. e2e3  7... b8d7  8. h2h3  8... f8d6  9. f1d3  9... c7c6  10. g5f4  10... d8c7  11. f4d6  11... c7d6  12. e1g1 