White’s idea with 5. a4 is to prevent his opponent from playing dxc4 and supporting that pawn with b7-b5. However, playing a4 weakens the b4-square, and Black often makes use of it by deploying his Bishop or Knight on that place. Black’s typical reaction is 5… e6, and now White has a wide range of choices.
If White opts for a kingside fianchetto with 6. g3, he loses just enough time to allow his opponent’s counteraction in the center with 6… dxc4 7. Bg2 c5, which gives Black a quite satisfactory position.
[Diagram: Black to Move] Black sacrificed an exchange in the early stage of the game, and now needs to play a few accurate moves to secure a draw. How should he continue?
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