Rooks Belong Behind Passed Pawns: The Tarrasch Rule

Watch the method: press play to see the winning idea run, or step through it move by move.

Tarrasch's rule is the most quoted sentence in endgame literature: put your rook behind the passed pawn, whether the pawn is yours or your opponent's. This drill shows the rule from the winning side, and why it is geometry rather than proverb.

The asymmetry. A rook behind its own passer gains scope with every pawn step: the pawn marches away from it, opening squares on the file. The rook in front, blockading, loses scope with every step for the same reason, until on the seventh rank it has no squares left at all: any rook move lets the pawn promote. One rook improves by doing nothing; the other degrades by doing nothing.

The conversion. The pawn cannot promote by itself while the blockader sits on the queening square, so the final act belongs to your king: walk it up the board under the rook's cover and attack the blockader. The defender must abandon the file (pawn queens), trade rooks (lost pawn ending), or drop the rook. There is no fourth option.

The mirror lesson matters just as much: when the passed pawn is your opponent's, the same geometry says your rook belongs behind IT, harassing from the tail instead of blockading in front. One rule, both directions, thousands of half points. Here you drill the pleasant direction.