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Strategy

Isolani

an isolated queen's pawn (IQP)

An isolated d-pawn — dynamic and space-giving in the middlegame, a target in the endgame.

The isolani (usually a d4 or d5 pawn with no friendly pawns on the c- or e-files) is the great two-sided imbalance. Its owner gets open lines, the e5/e4 outpost and attacking chances; the defender blockades it on d5/d4 and aims to win it in a simplified ending.

Whole opening systems — the Tarrasch, many QGD lines — are debates about whether the isolani's activity outweighs its weakness.

Why it matters

Knowing which side the isolani favours tells you whether to keep pieces on (attacker) or trade them off (blockader).

The mistake everyone makes

As the attacker, trading into an endgame where the isolani is simply weak; as the defender, letting it advance and free the position.

Related terms

Isolated pawn
A pawn with no friendly pawns on the files beside it, so no pawn can defend it.
Outpost
A square in or near enemy territory, protected by a pawn, where a piece can sit untouchable.
Blockade
Placing a piece directly in front of an enemy pawn to stop it advancing.
Pawn structure
The arrangement of the pawns, which shapes the plans available to both sides.

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