Prophylactic thinking

Prophylactic thinking means looking at the position from the opponent's side before deciding. Prophylaxis means prevention: instead of waiting for a threat to become fully visible, the player identifies what the opponent wants and what conditions would make it work.

Questions that guide the process

1. If I passed the turn, what would the opponent's best move be?
2. Is there an immediate threat or a slower plan that would greatly improve their pieces?
3. What concrete reply would the opponent have against my candidate move, the option I am considering?
4. Can I prevent, hinder, or neutralize that idea while improving my own position?

The answer is not always a defensive move. The best prophylaxis may be a stronger threat, an exchange of a key piece, or control of a square the opponent has not occupied yet. The aim is to include the opponent's resources in move selection, not to stop every imaginable idea.

This routine reduces errors caused by analyzing only one's own plan. It also reveals when an apparently quiet move allows a concrete reply or a refutation, a response that proves the idea does not work.