[October 16, 2017] Updated Opening Line by GM Trajko Nedev:
Petroff Defense, Classical Attack – Jaenisch Variation (Main Line with 8… Nb4)

[Line 357 : 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. O-O Be7 8. c4 Nb4 9. Be2 O-O 10. Nc3 Bf5]

By far the main move for White is 11. a3, where after the forced 11… Nxc3 12. bxc3 Nc6 White usually continues with 13. Re1. Now, if Black opts for 13… Bf6, one of the ways to fight for advantage as White is 14. Bf4 Na5 15. cxd5 Qxd5 16. Qa4, while after 13… dxc4 14. Bxc4 Bd6 White’s position is preferable if he plays 15. Ng5 Qd7 16. Ra2 (followed by Rae2), as well as after 15. Bg5 Qd7 16. Nh4 Na5 17. Ba2.

In view of the variations discussed above, move 13… Re8 seems like the best option for Black, where after both 14. cxd5 Qxd5 15. Bf4 Rac8 and 14. Bf4 dxc4 15. Bxc4 Bd6 Black is able to equalize with a couple of accuracies.

[Diagram: White to Move] White has sacrificed an exchange and needs to act vigorously to justify his choice. How would you proceed?

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