Weak Squares & Colour Complexes: chess middlegame concept

Squares your pawns can't defend

A weak square is one no pawn can ever defend again. A knight there can't be shifted.

• A square is weak when no pawn can ever defend it again.
• Knights love weak squares, especially deep in enemy territory.
• Don't weaken every square of one colour around your king.
• Before pushing a pawn, ask what you weaken forever.