This is the expected continuation. White has fianchettoed their king’s bishop, and Black is practically forced to either play the logical 2…Nc6 (preparing …Bb7), or a move like 2…d5, which takes up the centre and protects the threatened rook, but reduces the scope of Black’s bishop. Of course, 2…c6 is playable but very passive, and all other moves are blunders that fail to 3. Bxa8.

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1.g3 b6 2.Bg2