Outside passed pawn
An outside passed pawn is a passer on a distant wing that works as a decoy: the defending king has to go and stop it, and the moves this takes let the other king win pawns elsewhere.
Think of the pawn as a bill the defender must pay in moves. To stop it, the defending king has to walk across the board, and every step it takes there is a step not spent guarding its other pawns. Meanwhile the attacking king walks the other way and collects them. The diagram shows the trade of time move by move.
That is why the side owning one is usually glad to trade pieces and reach a pawn ending. The farther the pawn stands from the other pawns, the longer the defender's trip, so an a- or h-pawn works best.
Timing matters. Advance the pawn when the enemy king is close enough to be forced to react, so that each step drags it farther away. Pushing it to its death while the defending king sits next to it wastes the asset.
With pieces on the board the effect weakens. A rook placed behind the pawn can watch it from a distance without its king leaving, and a bishop on a long diagonal can do the same. Knights struggle against a far-off pawn, so the decoy stays strong in knight endings.
When defending, the remedy is counterplay: a passed pawn of your own on the other side, or an active king that reaches the main group of pawns first.
It sits close to Queenside majority structure. A pawn structure where one side has more pawns on the queenside than the opponent, such as three against two, and can create a passed pawn there while the other side holds a kingside majority.
Compare it with Connected passed pawns. Connected passed pawns are two passed pawns on adjacent files that support each other and can advance together, so the enemy cannot stop them one at a time and they often decide an endgame.
Also worth reading is Pawn breakthrough. A pawn breakthrough is a sacrifice of one or more pawns that tears open the opposing pawn chain so that a remaining pawn can run through and promote.
Endgame ideas like "Outside passed pawn" are won or lost on small details, which a coach can check in your own games. The first lesson with George Li is where that review starts.
Related terms
A passed pawn has a clear road to promotion as far as enemy pawns are concerned: none stands ahead of it on its own file or the two neighboring files, so the opponent must spend a piece or the king to stop it.
Connected passed pawns are two passed pawns on adjacent files that support each other and can advance together, so the enemy cannot stop them one at a time and they often decide an endgame.
King activity describes how freely a king can take part in the endgame, by centralizing, attacking enemy pawns and supporting its own, and the more active king frequently decides otherwise equal positions.
A king and pawn endgame is an ending in which only kings and pawns remain, so the result depends on promotion races, king placement, opposition, and exact counting of moves.
A pawn promotion race is a position where both sides push passed pawns toward promotion, and the result depends on who queens first and what the new queen can do.
Guides that go further
What to decide first, the questions to ask, what a first lesson should show and the red flags to avoid.
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