The Moscow Variation (also known as the Canal Attack) is one of the most popular choices for the players of White that want to avoid heavily investigated positions in the Sicilian Defense, and 3… Bd7 is the simplest reaction from Black.
With 5. c4, followed by Nc3 and d2-d4, White wants to gain spatial advantage, and this is generally considered the most ambitious try for White. The game usually continues 5… Nf6 6. Nc3 g6 7. d4 cxd4 8. Nxd4 Bg7.
White can, at best, get a slight spatail advantage out of the opening, but Black can equalize comfortably if he plays correctly.
[Diagram: Black to Move] Black can get a serious advantage if he finds the best moves. How should he continue?
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