In short: When one player has more room for their pieces than the other, usually thanks to pawns that have advanced far.
Also called space advantage.
Space is room. Pawns that have advanced far create room behind them, and there your own pieces can move freely. On the other side of the pawns, your opponent's pieces get less room and easily get in each other's way.
In the diagram it is White who has more space on the kingside. In return Black has a plan: to attack White's pawn chain at its base, on d4. Read more about pawn chains and about the French Defense.
The cramped side wants to trade
With many pieces on the board you need room, and the cramped side finds it hard to get them all into play. So that side often wants to trade pieces. With fewer pieces left, the space advantage counts for less. The side with more space, on the other hand, often wants to keep the pieces and avoid trades.
Space has a price
Pawns that have advanced far can't go back. The squares behind them can no longer be guarded by pawns, and the advanced pawns themselves can become weak. In the endgame, once the pieces are traded, the side that was cramped can end up standing better. That was one of the hypermodern ideas: let your opponent take space, and then attack the pawns. Read about hypermodernism.
Frequently asked questions
How do you see who has more space?
A simple way is to look at the pawns. The further forward they stand, the more squares there are behind them for your own pieces.
What do you do if you are cramped?
Trade pieces. With fewer pieces on the board less room is needed, and the side with more space gets less out of it.
Updated November 14, 2026