1. e2e4  1... c7c5  2. g1f3  2... g8f6  3. b1c3  3... d7d5  4. e4d5  4... f6d5  5. f1b5 The players had a theoretical debate in this variation during this dramatic match. 5... c8d7  6. f3e5  6... d5f6 