Definitions for "Passed pawn"
Keywords:  pawn, enemy, queens, chess, flank
A pawn with no opposition on an adjoining file.
A pawn with has no enemy pawn either on its FILE or on adjacent FILES on the RANKS in front of where it now stands.
A pawn that has passed by all enemy pawns capable of capturing it. In the diagram, White has connected passed pawns on g5 and h6. Black has a passed pawn on a7 and a protected passed pawn on e4.