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Attack on the uncastled king: pawn to a4 (b3·15)

sf-u-0050
Puzzle rating: 780Theme: Uncastled king: the enemy king is stuck in the centre — punish it before it castles.
a8b7c6d5e4f3g2h1
White to move — find the best continuation

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The tactical motive

Uncastled king: the enemy king is stuck in the centre — punish it before it castles.

White to move — find the best continuation

Solution & explanation

Main line

21. bxa4 O-O-O 22. a5 g5 23. a6

Why it works

  • Great move! pawn to a4 keeps the pressure (+5.8).
  • Spot on — pawn to a5 (+5.4).
  • A natural move: pawn to a6.
  • You win a piece — the queen.
  • If instead O-O-O, then Nf3 and you win the queen.

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