1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... g8f6 The Berlin Defense, widely considered Black's most reliable option against 1.e4, makes its first appearance in this duel. This is impressive, as a feature of world championship matches is that the openings are usually repeated. This is yet another feature that makes this match unique. 4. d2d3  4... f8c5  5. c2c3  5... e8g8  6. e1g1  6... d7d5  7. b1d2 