Positional Any phase Rating <1000

Passed Pawn

A passed pawn has a clear road to promotion — no enemy pawns in front of it or on the files beside it can stop it. That makes it a constant long-term threat, always one step closer to becoming a queen. As the saying goes, passed pawns must be pushed.

Passed Pawn — example position

The white pawn on e6, escorted by its king, is a passed pawn: no black pawn stands in front of it or on an adjacent file to stop it promoting.

Source for further study: Nimzowitsch, My System.

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