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opposing [[Pawn|pawns]] in contact that can [[Captures|capture]] each other. In chess the term lever is also used as '''option''' to attack an opposing pawn by a [[Pawn Push|push]] or [[Pawn Push#DoublePush|double push]]. In ''Pawn Power in Chess'' <ref>[[Hans Kmoch]] ('''1959, 1990'''). ''Pawn Power in Chess''. New York: Dover, 1990. Previous ed.: New York: McKay, 1959. ISBN 0-486-26486-6</ref>, [[Hans Kmoch]] classified levers in the following way <ref>[https://www.chess.com/forum/view/chess-equipment/pawn-power-in-chess-by-hans-kmoch-glossary-of-terms Pawn Power in Chess by Hans Kmoch - Glossary of Terms - Chess Forums] - [https://en.wikipedia.org/wiki/Chess.com [Chess.com]]</ref>:

* [https://www.chess.com/forum/view/chess-equipment/pawn-power-in-chess-by-hans-kmoch-glossary-of-terms Pawn Power in Chess by Hans Kmoch - Glossary of Terms - Chess Forums] - [https://en.wikipedia.org/wiki/Chess.com [Chess.com]]