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Strategy

Prophylaxis

Preventing the opponent's ideas before pursuing your own.

Prophylactic thinking asks, 'What does my opponent want to do?' and quietly takes it away — stopping a pawn break, a piece manoeuvre, or a freeing trade before playing for your own plan.

It is the hallmark of mature, patient chess, associated with players like Petrosian who won by never letting the opponent do anything.

Why it matters

Half of strong play is stopping the other side's plan; a move that does nothing for you but kills their idea is often the best on the board.

The mistake everyone makes

Charging ahead with your own plan while ignoring the one obvious thing the opponent is threatening.

Related terms

Strategy
The long-term plan — where pieces belong and which structures to aim for — as opposed to tactics.
Initiative
The ability to make threats the opponent must answer, keeping them reacting rather than acting.
Weak square
A square that can no longer be defended by a pawn, inviting an enemy piece to settle there.
The centre
The four central squares (d4, e4, d5, e5) and the fight to control them.

See Prophylaxis in your own games

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