In short: Protecting an important square, pawn or piece more times than is needed right now, so that the opponent doesn't even try to attack it.
To protect a piece or a square is to guard it. To overprotect it is to guard it more times than is needed right now. It sounds wasteful, but for a really important point it can be wise.
Why guard more than you need?
- Your opponent is deterred. If the point is guarded four times, attacking it doesn't pay. Overprotection can be seen as a kind of prophylaxis: you prevent an attack before it has begun.
- The pieces stand well. Pieces guarding a strong point in the center often stand on good squares for other reasons too.
- You get freedom. If one of the pieces is needed elsewhere, it can go, because the others still guard the point.
Nimzowitsch's idea
The term comes from Aron Nimzowitsch, who in the 1920s put forward overprotection, prophylaxis and blockade as new positional ideas. He believed especially in overprotecting important central points. Nimzowitsch was one of the leading figures of hypermodernism. Read more about hypermodernism.
Frequently asked questions
Isn't it a waste to protect more than necessary?
Not if the point matters. Your opponent finds it hard to break up the position, and if one of the pieces is needed elsewhere it can go, because the others still protect the point.
How is it different from prophylaxis?
Prophylaxis is moves that prevent the opponent's plans. Overprotection can be seen as a kind of prophylaxis: you guard a point so well that the opponent doesn't try to attack it.
Updated November 14, 2026