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Réti Opening: Anglo-Slav Variation is a chess opening that arises after 1.c4 Nf6 2.g3 c6 3.Nf3 d5 4.b3. It is classified A12 in the ECO system, and the position after these moves has black to move.
This position can also be reached by another move order, including 1.Nf3 d5 2.c4 c6 3.g3 Nf6 4.Bg2 e6 5.b3 Be7 6.Bb2.
This line is a variation within the Réti Opening family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.c4 Nf6 2.g3 c6 3.Nf3 d5 4.b3.
Each of these is a named opening reached by playing on from 1.c4 Nf6 2.g3 c6 3.Nf3 d5 4.b3. Open any of them to load the position on the board.