Queen's Gambit Declined Slav - Czech defence
1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5
White plays the queen's pawn to d4. Black pushes the queen's pawn to d5. White advances the c-pawn to c4.
Black advances the c-pawn to c6. White develops the knight to f3. Black develops the knight to f6.
White jumps the knight to c3. Black captures on c4 with the queen's pawn. White pushes the a-pawn to a4.
Black develops the light-squared bishop to f5.