1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... d7d5  4. c4d5  4... e6d5  5. c1g5  5... c7c6  6. d1c2 The famous Carlsbad pawn structure has been reached, named after the current town Karlovy Vary in the Czech Republic. 6... h7h6 A modern treatment of the position. 7. g5h4  7... c8e6  8. e2e3  8... b8d7  9. f2f3 A flexible idea that can be attributed to Botvinnik. The great champion liked to play aggressively in the center in this system, rather than following the routine path of the minority attack. 9... f8d6 