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=External Links=
* [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]]
* [https://en.wikipedia.org/wiki/Duet Duet from Wikipedia]
* [https://en.wikipedia.org/wiki/Phalanx Phalanx from Wikipedia]
