Chess Opening Theory/1. Nf3/1...c5

=Sicilian Invitation (Réti Opening)=

1...c5
Black invites white to transpose into the Sicilian Defence with 2.e4. White has a number of other choices here. 2.c4 transposes into a Symmetrical English. Many other moves are possible—the position is still very flexible for both sides.

Theory table
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1. Nf3 c5