ChessRanger
Endgame

Fortress

A drawn setup the stronger side cannot break down despite being materially ahead.

Sometimes an extra piece or several pawns simply cannot win: the defender builds a wall — a pawn chain, a well-placed king and piece — that the attacker has no way to penetrate. The position is a dead draw by construction, not by counting material.

Classic fortresses include the wrong-rook-pawn-and-bishop draw and certain opposite-coloured-bishop endings a whole pawn or two up.

Why it matters

Knowing a fortress exists lets the weaker side steer toward it and saves lost-looking positions; the stronger side learns which extra material is an illusion.

The mistake everyone makes

Trading into an 'extra pawn' endgame that is actually a known fortress draw, or as the defender, breaking your own fortress by looking for activity.

Related terms

Opposite-coloured bishops
Each side has one bishop, on opposite colours — strongly drawish in the endgame, sharp in the middlegame.
Philidor position
The fundamental drawing technique in rook endgames — the third-rank defence.
Opposition
Kings facing each other with one square between them; the side NOT to move usually holds the advantage.

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