zydeco: This is a really professional, high-level game.
Unzicker is slightly premature in his kingside plans with 13.Qg3, allowing Najdorf his chance to strike in the center. 13.Rad1 was safer.
Both players criticized 16.Nd5.
Najdorf considered 19....Bg7 "an excess of prudence, preventing a hypothetical 20.Rxf6." He could have played 19....b6 instead.
Unzicker presses with 20.c5. Najdorf gains material with a very pretty combination, starting with 23.....Qxd5. The point is that white can't save his bishop on move 25 because of 25.....Nf2+!
Unzicker gets wonderful activity for his rook with 27.Ra3, and, in the ending, the rook and passed pawn are strong enough to neutralize black's minor pieces without any participation from either king.