Playing with hanging pawns
The strength and the weakness of two pawns standing side by side in the center
Look at the following pawn placement.
The pawns on c5 and d5 are called hanging pawns. They stand side by side, the neighboring files (b and e) hold no black pawns, and no white pawns stand in front of them. This structure often arises in various closed openings, so the way hanging pawns behave is well worth studying in practice.
While these pawns stand side by side, they take several central squares on the 4th rank away from the opponent's pieces and cramp them. Defending hanging pawns, however, often gives their owner plenty of trouble. Moving either of them forward hands the opponent's pieces comfortable squares in the center, the pawns can end up blocked, and the pawn left behind becomes vulnerable — no other pawn can defend it anymore.
Advancing one of the hanging pawns is therefore justified only by a concrete aim: pressure on the b2 pawn (after c5-c4), undermining the opponent's position (after d5-d4), opening lines for your own pieces. In short, pushing one of the hanging pawns is a serious commitment, and you should weigh everything carefully before you go through with it.
Here are a few examples that show the weakness and the strength of hanging pawns:
Check yourself
Recall the idea in your own words, then reveal the answer.
What's the strength of hanging pawns standing side by side in the center?
They take several central squares in front of themselves away from the opponent's pieces and cramp them.
What does a side risk by advancing one of its hanging pawns?
The opponent's pieces get comfortable squares in the center, the pawn can end up blocked, and the one left behind loses its pawn protection.
What can justify advancing one of the hanging pawns?
Only a concrete aim — for example, pressure on a weak opponent pawn, undermining their position, or opening lines for your own pieces.