Doubled Pawns, Chess Wiki

Doubled pawns are 2 pawns sharing the same File on the board. Like Isolated pawns, they are a hindrance because they block each other from moving. Usually doubled pawns do not have any other pawns defending them, so they are prime targets. They also have a limited range of attack. If there are three pawns stacked on a File, then they are called tripled pawns. Doubled pawns are often the results of trades or gambits.

How to Become a Better Chess Player: 16 Grandmaster Tips

Doubled Pawns - Chess Terms

How to Win at Chess (with Pictures) - wikiHow

Pawn, Chess Wiki

How to Ruin Your Pawn Structure

Chess Glossary : Section C - Chess Game Strategies

The best way to learn chess

Doubled Pawns, Chess Wiki

The Fish That Roared

Chess & Strategy: The Pawn Structure – Chess Chivalry