Move 8. a4 leads to the currently most popular variation of the Anti-Marshall, which occurs quite frequently on the highest level.
One of the popular follow-ups here is 8… b4 9. d4 d6 10. dxe5 dxe5 11. Nbd2 Bc5, seen in a couple of games by Svidler, Caruana and Aronian.
Somewhat less concrete is 8… b4 9. d3 d6 10. a5 Be6 where, again, Black more or less has equal prospects.
[Diagram: Black to Move] White’s queenside is completely undeveloped, and Black just needs to launch a decisive attack on his opponent’s King!
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