Réti Opening: Anglo-Slav Variation

1. c4 Nf6 2. g3 c6 3. Nf3 d5 4. b3

Réti Opening: Anglo-Slav Variation is catalogued under ECO code A12. It is reached after 4 moves (7 half-moves): 1. c4 Nf6 2. g3 c6 3. Nf3 d5 4. b3. After the last move it is Black to play. White opens 1. c4. It is a named variation of the Réti Opening, which has 43 catalogued lines in total.

Position shown after the last move; Black to play.