Line 405 covers an interesting variation 10. d4 Nd7 11. Nbd2 exd4 12. cxd4 Bf6, which recently became popular after the Giri – Svidler game, played during the last World Cup. Though Svidler managed to win that important game, White’s accurate treatment of the line should have given him a slightly preferable position.
Another important variation covered in the Line 405 is a sideline in the Zaitsev Variation, which occurs after 10. d4 Re8 11. Nbd2 Bf8 12. a3. White will later often proceed with either Bc2 or Ba2, followed by b4, which will lead to mostly maneuvering play.
[Diagram: Black to Move] White plans to push his e- and f- pawns, but his King is a bit exposed. It’s Black’s turn to move, and an attractive response completely turns the tables in his favor!
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