Prophylaxis: a practical example
Before improving a rook, you might notice that the opponent wants to establish a knight on a strong outpost. A pawn move, exchange, or piece placement may remove that possibility while still improving your own position.
How to use the idea in your games
Ask what you would play from the opponent's side. Good prophylaxis addresses a real plan; spending moves stopping harmless possibilities can give away the initiative.
A useful study question
Can you explain prophylaxis in your own words, identify it in a position, and describe when the idea does not apply? Test the explanation on a legal board before relying on it.
Connect the ideas
Outpost, Initiative, Weak square are useful next concepts. Follow the links to compare definitions and examples, then return to the complete chess glossary whenever an unfamiliar term appears.
Sources & further reading
References checked September 5, 2026. Linked services are independent of ChessRankings.com™.