pawn structure
configuration of pawns on the chessboard
hanging pawn
two pawns on the same rank on adjacent files with no pawns of the same color on the files either side of them
lever
pair of opposite-color pawns situated diagonally
doubled pawns
two pawns of the same color residing on the same file
pawn chain
two or more pawns of the same color diagonally linked
Carlsbad formation
pawn structure with d4, e3 White pawns and c6, d5 Black pawns