This game occurred in the 1989 World Open. Formanek chose a line in the Nimzoindian that allows White to get a space advantage in a locked center. Silman's performance here is a great example of how to handle such positions. This game is of interest to me since I will sometimes play a Queen's Indian/Nimzoindian setup with the Black pieces.
The articulated Stonewall structure that appears after Black plays 35...a5 belongs in a Pawn Structure Museum!