Pawn endgame
The Outside Passed Pawn
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An outside passed pawn sits well away from the other pawns. Its value comes from distance: the defending king may have to choose between stopping it and protecting pawns on the other wing. Sometimes the passer promotes; sometimes it is given up to draw the king away. Calculate which role it can perform before pushing it.
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The two threats to compare
In the diagram White’s a-pawn is far from the f-pawns. White to move is winning according to Syzygy, and 1.a5 is a direct plan. Black’s king can head towards the a-file, but the pawn’s speed and White’s king access on the kingside leave Black with no satisfactory way to cover both fronts. The result comes from a race, not from the word “outside”.
Runner, decoy or reserve tempo?
- Runner: if the king is outside the square, the pawn may promote without help.
- Decoy: if the king can catch it only by travelling away, the attacking king may use those moves to take pawns on the other wing.
- Reserve tempo: if pushing now gains nothing, keeping the pawn back may preserve a move for a later zugzwang.
Do not push by reflex
Every advance shortens the pawn’s route but may also bring it inside the king’s reach or fix it on a square that another pawn can attack. Count both races after the likely capture, not only until the outside pawn is caught. If your king needs three moves to win the kingside and the defender needs four to collect the passer and return, the decoy has done its work.
Creating one
A pawn majority can sometimes create an outside passer through an exchange, but the order matters. Identify which recapture leaves the surviving pawn farthest from the enemy king. Before initiating the exchanges, check for an opposing breakthrough: simplifying one wing can give the other side a protected passer of its own.