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StrategyChapter 13 · Prophylaxis

Prevent their plan.
Stay active while defending.

Strong defense is threat recognition plus counterplay—not passive waiting.

ConceptUnderstand before you move

Use prophylaxis to stop an opponent’s best idea before it becomes forcing. When attacked, compare direct defense, simplification, counterattack, and changing the character of the position.

  • Ask what the opponent would play if they had another move.
  • Remove the cause of a threat when possible, not only its symptom.
  • Create luft, trade key attackers, return material, or seek counterplay when the king is under pressure.
Last moveO-Oe8 → g8White to move
FEN & PGNTap any move above for its position+
FEN · current
r1bq1rk1/pp3ppp/2nbpn2/2pp4/3P4/2PBPN2/PP1N1PPP/R1BQ1RK1 w - - 3 8
PGN · through this move
1. d4 d5 2. Nf3 Nf6 3. e3 e6 4. Bd3 c5 5. O-O Nc6 6. c3 Bd6 7. Nd2 O-O
♘
Your move

Give the king an escape square and reduce back-rank danger.