The Vancura Position
Black to play and draw, after Vancura
PlayThe rook pawn's secret: attack it from the side, keep checking distance, and the strongest attacker cannot untangle. Elegant, counterintuitive, essential.
No signup needed. The opponent never gives up, and every mistake gets explained.
The Vancura Position
Hold the draw against perfect play
Setting up the board…
The theory
Rook pawns break every normal rule of rook endings, and the Vancura position is the crown jewel of the exceptions: rook and a-pawn (or h-pawn) versus rook, pawn on the sixth, and the defense holds without the defending king ever reaching the corner.
The formation. The defending rook attacks the pawn from the side, along the third rank (the pawn's sixth), at checking distance from the attacking king. The attacker faces an impossible knot: advancing the pawn to the seventh lets the rook check from the side forever (the king has no shelter; its own pawn occupies it); defending the pawn with the rook ties it to a passive square; approaching with the king walks into the prepared checks, after which the rook returns to its post.
Why side, not behind? The habitual 'rook behind the passed pawn' loses here: the attacking rook lifts in front of its own pawn, shoulders your king away, and escorts the promotion. The Vancura's sideways geometry is the only fence that holds.
Know the trigger. The defense must be set up BEFORE the pawn reaches the seventh. This drill starts at the critical moment: one setup move too slow and the tablebase attacker converts.