1. e2e4  1... c7c6 The world champion decided to use the Caro-Kann in the final  phase of the match. 2. d2d4  2... d7d5  3. e4e5 While So put his hopes on the  Advanced variation. 3... c8f5  4. g1f3  4... e7e6  5. f1e2  5... h7h6  6. e1g1 