Chess Opening Theory/1. e4/1...a6/2. d4/2...b5/3. Nf3

= St. George Defence = Development keeps going. Black should now play /3...Bb7/, putting pressure on the e pawn (remember that White cannot play Nc3 to protect the pawn !). /3...e6/ can also be played (and will anyway be played at some point in the opening), but why giving White more liberty when it's possible to force the following moves ?

Theory table
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'1.e4 a6 2.d4 b5 3.Nf3'