Keeping Your Opponent Helpless
Seirawan Strategy Example #3

Winning Chess Strategies, Diagram 15, p40

The key feature of this example, according to Seirawan, is the Opposite-side Castling (Black's gone Queenside; White's taken the shorter Kingside option).

Black's Plan: Note the Half-Open File where White's King currently sits (g-file), as Black sends both Rooks onto it, creating a Battery, which apply pressure down against the weakened position in the region of White's King.

White's Plan: With Black's King on the Queenside, White strategy is to push the a-Pawn (a4-a5) and then try and get at Black's King, somehow.

White's Plan is a lot easier said than done, as Black does a good job at restricting White's options to virtually nothing ...

PGN

Notes:

BOOK ERROR! On page 40, Diagram 15 is incorrect. Set it up in Fritz 12 and then try and make Move 6. a5 b5, then you'll see! ...

No worries, it's just an oversight by the publisher's proof readers ... Seirawan's explanations are fine for the actual game, which is correct if you copy the above PGN code to your chess program (e.g. Fritz 12).

If you want to verify, click here, to play through the game (Moves 17-22), between Spassky & Petrosian, as documented by ChessGames.com (excellent database resource, containing PGNs on thousands of historical and significant games of Chess, which you can freely copy to chess software such as Fritz 12).
[Event "?"]
[Site "Moscow"]
[Date "1966.01.08"]
[Round "7"]
[White "Boris Spassky"]
[Black "Petrosian"]
[Result "0-1"]
[ECO "A46"]
[SetUp "1"]
[FEN "2kr3r/pbqnbp2/1p2p3/2ppP2p/PP3B1p/2PBPN2/5PP1/R2Q1RK1 b - a3 0 17"]
[PlyCount "11"]
[EventDate "1966.??.??"]

17...c4 18.Be2 a6 19.Kh1 Rdg8 20.Rg1 Rg4 21.Qd2 Rhg8 22.a5 b5 *

End.