1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g2g3  3... d7d5  4. f1g2  4... d5c4  5. g1f3  5... f8b4  6. c1d2  6... a7a5 Topalov had used this line as a main anti-Catalan weapon in two WCC matches, against Kramnik and Anand. 7. a2a3  7... b4d2  8. b1d2 