1...Nd7 was safer, enabling a later ...Nd7 f6, although after 2.Ba3 Qe6 3.Qc2! , with the double idea of 4 Rd6 and 4 Bd3, White keeps excellent compensation.

3...Qd8 4.Ng5+ Kf6 5.Qc3 Qb6 6.f4 +-

Preparing Rf2 and Rdf1, leaves Black with a hopeless position – Khalifman.

Preparing Reb1 and b3-b4 in order to clear the b-file towards the target on b7.

Please note that the immediate 1.Rab1? would have failed to 1...a5! , closing the queenside.
While 1.Rh1+?! Kg8 followed by ...f7-f6 isn't at all productive for White.

Karpov is not distracted by the g5-pawn, but sticks to his plan.

Since 3...cxb4 4.Rxb4 is hopeless for Black, Spassky tries a counterattack.

4.exf5?! e4 5.Bd2 exf3+ 6.Bxf3 gxf5 , when the connected pawns and the strong bishop on g7 yield Black some slight compensation for the piece.

The d6-pawn proves to be doomed.

7...Kg8 8.Rxd6 Bxg5 9.Rxg6+ +-