Slav Defense: Exchange Variation, Schallopp Variation

The Slav Defense: Exchange Variation, Schallopp Variation is a chess opening classified under ECO code D13 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 6 moves: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 Bf5 5. cxd5 cxd5 6. Nc3. The resulting position leaves black to move.