1. e2e4  1... e7e6  2. d2d4  2... d7d5  3. e4e5  3... c7c5  4. c2c3  4... b8c6  5. g1f3  5... d8b6  6. a2a3  6... c8d7 Berkes had played this line in his World Cup match against Vitiugov. 7. b2b4  7... c5d4 