ChessRanger
Strategy

Colour complex

Persistent strength or weakness on squares of one colour — often after a key bishop is gone.

When a fianchettoed bishop is traded or pawns are fixed on one colour, the squares of the opposite colour can become chronically weak. Control of a colour complex — say, the dark squares around a king — is a lasting, structural advantage.

The most famous case is the weakened dark squares after the King's-Indian bishop on g7 is exchanged.

Why it matters

Thinking in colour complexes explains many long-term plans: trade the defender of a colour, then invade on those squares.

The mistake everyone makes

Trading your 'good' bishop (the one covering the colour you're weak on) and handing the opponent a permanent grip.

Related terms

Weak square
A square that can no longer be defended by a pawn, inviting an enemy piece to settle there.
Outpost
A square in or near enemy territory, protected by a pawn, where a piece can sit untouchable.
Bishop pair
Owning both bishops while the opponent has a bishop and knight, or two knights.
Opposite-coloured bishops
Each side has one bishop, on opposite colours — strongly drawish in the endgame, sharp in the middlegame.

See Colour complex in your own games

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