[NajdorfDefense]

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I think f3 is best for him after Qd5+
f3 Rc6
Bd2 finally linking his rooks.

Rc6 still seems like the superior move here, as we are not sure if the Q belongs on b6, d7 or d5. Qd5 I think is mistakenly overanxious and denies that square to our Knight.

If now...Rc6 then perhaps White responds with
Be3 Qd7
Rfe1 Rec8 seizing the c-file, followed by Nd5 knocking his bishop off e3/f4 [the best squares for his B], then Nb4 with our rooks coming to rest on c2 and his second rank.

His dark-squared B cannot defend c2. That is the weakest point in his position, so we must go after it. With a rook on c2 his a2 and f2 are very week, and a later Qd5+ leaves his f-pawn pinned.

Naj

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Bd2 is always there covering not only f4 e3 c3 and b4, but also e1 and c1 meaning that if we double rooks on either file, he can just oppose on the same file with one of his rooks.

We aren't getting to c2. He can answer any rook doubling attempt with Bd2 and Rc1 or e1. You are dreaming if you think he will just let us get into his 2nd rank without it being forced.

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I think you are missing the point, Tim.

With Rc6 followed by Rc8 and a later Nb4, we dominate the c2 square. The bishop can't defend it and if he defends with Rc1 we still play...Rc2, if he exchanges RxR we also exchange RxRc2 and have a defended Rook on c2. He cannot take our second rook with his Q because the Knight defends it.
If he then plays Rc1 to move us off the file, we take his a2 pawn and we are still happy on his second rank AND defended by our b4 Knight.

I think Rc6 first is better with a later Qd7, or Qd5+ or Qb6 depending on what Curtains does. An immediate Qd5+ is not better than Rc6...Qd5 with the same + and f3 if need be.

The distant endgame ideas are just that, not immediate threats, c'mon now, you know this.
Most people on this thread don't know what a Queenside attack is or how to create a passed pawn, or what weak squares to look for in a NvB endgame - I'm suggesting one possible winning endgame idea, doesn't mean it automatically happens, of course.