Weak squares & outposts

A square no pawn can ever guard.

A hole is a square one side's pawns have permanently given up. Once a pawn advances past a square, no pawn can ever guard it again — pawns don't move backward, so the weakness never heals. A piece (especially a knight) parked on that square becomes an outpost: it can't be chased by a pawn, and from a central hole like d5 it radiates pressure across the whole board.

The Imbalance Scan: when you size up a position, hunt for holes in the enemy camp. A central hole that you can occupy and the opponent can't undermine is a lasting trump — often worth steering the whole game toward, even when the material is level.

A hole is a square the opponent's pawns can never control again.
Holes appear when a pawn advances (or is traded) and leaves squares behind.
An outpost = a piece on a hole, supported and unkickable. Knights love them.
A permanent outpost is a long-term advantage — don't trade the piece that wants it.

The knight on d5 sits on a hole — Black has no c- or e-pawn to evict it. From there it stabs at e7, f6, c7 and b6 at once.

Black's missing c-pawn plus the pawn on e5 leave d5 permanently weak. White's knight heads for it: Nc3–d5 (or the scenic f3–e1–c2–e3–d5).

What makes a square a true 'hole' for the opponent?

Answer the question to keep going!