In an earlier post (Who Are You Rooting For?), I mentioned the Carlsen-Radjabov game from round 7, in which Radjabov missed a clear win with a bishop redirection from d6 to a5.
There are lots of examples of improving such a poorly placed piece, but there were a couple that sprang to mind right away. I’m not saying I’d have seen …Bc7-a5 in advance, but I’d hope that having these in my head would have helped.
2r2nk1/pp2r1pn/1q2bp2/3p3P/3P4/2NB1PQ1/PP2NK2/1R5R w - - 0 22)
I didn’t remember who played this game, but I remember that this position was the first quiz problem from Dvoretsky and Yusupov’s “Positional Play” book. (Turns out it was Knaak – Geller, from Moscow in 1982.)