This opening line deals with the main line of the Chigorin Variation in the Ruy Lopez.
Though moves 14. a3 and 14. d5 have been tried many times, they typically don’t pose serious problems to the players of Black, so 14. Nb3 represents a much more common option. After the usual follow-up 14. Nb3 a5 15. Be3 a4 16. Nbd2, moves 16… Be6 and 16… Nb4 are the alternatives to the main 16… Bd7. The game typically proceeds with 17. Rc1 Qb7, where White has several playable options. Among them 18. Qe2 and 18. Nf1 are the most promising moves that give White slightly better prospects.
[Diagram: White to Move] It seems like Black has a good counterplay along the c-file, but White’s initiative on the kingside is much stronger. How should White continue to gain a big advantage?
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