A tactic that Karpov and Kasparov both missed

Karpov – Georgadze, 1983

  Black to move. Where should the rook retreat?
In this position Black played 24… Rcc8 and experienced difficulties after White transferred the knight to c6. He later lost the game.
In his book “My 100 wins” (1984) Anatoly Karpov instead recommended 24… Rc7 (presumably to make sure that Be7 is guarded when White knight arrives to c6) 25. Nb4 Qf5 – “starting the counter attack as soon as possible”. There is a little tactical problem with that suggestion, that Karpov probably overlooked. It is ironic that Kasparov later copied the entire annotation in his Volume 5 of “My Great Predecessors”, without spotting the mistake (and I am pretty sure it is a mistake, since White gets to win a pawn or exchange on a spot without obvious compensation). That just goes to show that even world champions should blunder check their recommendations with engines (although of course there were no engines when Karpov’s book was first published).

Here is the position after Karpov’s suggested improvement of “Rc5-c7”.

White to move. How to win material immediately?