1. c2c4  1... c7c6  2. g1f3  2... d7d5  3. d2d4  3... g8f6  4. b1c3  4... d5c4  5. a2a4  5... c8f5  6. f3e5  6... b8d7  7. e5c4  7... d8c7  8. g2g3  8... e7e5 According to Megabase, the first time this complex Slav line occurred was back in 1929 (see below.) 9. d4e5  9... d7e5 