Queen's Gambit Declined Slav - Krause attack
1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. Ne5
White plays the queen's pawn to d4. Black pushes the queen's pawn to d5. White moves the c-pawn to c4.
Black moves the c-pawn to c6. White develops the knight to f3. Black develops the knight to f6.
White transfers the knight to c3. Black captures on c4 with the queen's pawn. White moves the a-pawn to a4.
Black develops the light-squared bishop to f5. White moves the knight to e5.