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Réti Opening: Anglo-Slav Variation, with g3 is a chess opening that arises after 1.c4 c6 2.Nf3 d5 3.g3 Nf6 4.Bg2. It is classified A11 in the ECO system, and the position after these moves has black to move.
This position can also be reached by 5 other move orders, including 1.c4 c6 2.Nf3 d5 3.g3 Nf6 4.b3 g6.
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 c6 2.Nf3 d5 3.g3 Nf6 4.Bg2.