11...Re8

Black activates the first major piece, occupies the open e-file, and pins the Knight on e2. Given the right circumstances, Black might even be able to triple the major pieces on the e-file with ...Re6, ...Qe7, and ...Re8. As for White, since the Queen's Knight is still blocking its neighboring Rook and the Queen is out of action, White will have difficulty opposing any buildup on the e-file.

Surprisingly, Korchnoi thought that the similar plan with 11...Qe7 was 'more accurate' than 11...Re8. We'll see why in a few moves.

Next move: 12.O-O