Keeping Your Opponent Helpless
Seirawan Strategy Example #5
Winning Chess Strategies, Diagram 17, p42
This example follows the same principle as was revealed at the end of the game featured in Example 4: "Make sure you take the time to stop any potential enemy counterplay, if your army holds a permanent advantage."
In Example #5, below, a quick study of the board, before 1...Kf8 reveals the quality of the opposing army's development, which in turn will tell us who hold a permanent advantage *:
In Example #5, Black (Seirawan) has the permanent advantage, as White isn't going to overturn all of Black's advantages any time soon -- he's not behind in material, it's just that White doesn't have the spare material to attack Black's weaknesses while defending the position surrounding his King.
Black, therefore "takes the time" to send his King across to the Queenside, where his Pawns are a little vulnerable, "to stop any potential White counterplay" (with the Queen and a4-Pawn).
Here's what happened ...