Slav Defense: Three Knights Variation

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3

Slav Defense: Three Knights Variation is catalogued under ECO code D15. It is reached after 4 moves (7 half-moves): 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3. After the last move it is Black to play. White opens 1. d4. It is a named variation of the Slav Defense, which has 52 catalogued lines in total. 6 deeper lines continue from here, listed below.

Position shown after the last move; Black to play.