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1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. g2g3  4... f8e7  5. f1g2 The preparation for the world championship match keeps giving fruits for the world champion, and in this game he manages to demonstrate one more powerful Catalan idea. 5... e8g8  6. e1g1  6... d5c4  7. b1a3  7... e7a3  8. b2a3  8... c8d7  9. a3a4 An interesting side-line according to Megabase. White quickly brings his bishop out, but in the process risks to lose his gambited pawn permanently. 9... d7c6  10. c1a3  10... f8e8 