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.