Slav Defense: Czech Variation, Dutch Variation, Sämisch Variation

The Slav Defense: Czech Variation, Dutch Variation, Sämisch Variation is a chess opening classified under ECO code D19 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 10 moves: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 e6 7. Bxc4 Bb4 8. O-O O-O 9. Qe2 Ne4 10. g4. The resulting position leaves black to move.