1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. b1c3  4... c7c5  5. c4d5  5... c5d4 Carlsen called this defense \"The Berlin against 1.d4,\" a very interesting view. It's a solid line whose main variations leads to an endgame that is hard to break. Every now and then, however, the Berlin and its associates are defeated. 6. d1d4  6... e6d5  7. e2e4  7... d5e4  8. d4d8  8... e8d8  9. f3g5  9... c8e6  10. c1d2 A rare move. 10... b8d7  11. c3e4  11... f6e4  12. g5e4  12... h7h6 This move prepares f7-f5, driving the knight out of its great position. The plan, however, weakens the black position. 13. d2c3 