Slav Defense: Czech Variation, Wiesbaden Variation, Sharp Line

The Slav Defense: Czech Variation, Wiesbaden Variation, Sharp Line is a chess opening classified under ECO code D17 in the Closed & Semi-Closed Games family, arising from 1.d4 d5, including the Queen's Gambit, Slav Defense, and related systems. It is reached after 8 moves: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. Ne5 e6 7. f3 Bb4 8. e4. The resulting position leaves black to move.