1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... g8f6 Berlin is popular, even in Kolkata. 4. d2d3  4... f8c5  5. b5c6  5... d7c6  6. b1d2  6... c8e6  7. e1g1  7... c5d6  8. d3d4  8... f6d7  9. d4e5  9... d7e5  10. f3e5  10... d6e5  11. f2f4  11... e5d4  12. g1h1  12... f7f5  13. d1h5  13... g7g6  14. h5e2  14... e8g8  15. d2f3  15... d4f6  16. e4e5 With more or less pieces on the  board, but the Berlin pawn structure arose again. White has a defended  passer on the kingside and Black can hardly make anything out of his  queenside pawns in a possible endgame. 16... f6e7 