Problem p067

한국어

within 3, 5 legal points

Black to play. Capture the marked white stones within 3 moves.

Stones to capture: B9, C9, D9, B8

Black to play.

Why this is the move

White has 5 possible answers. Every one of them is listed below with the way Black captures. These are search results, not written commentary.

  1. Black D8, White pass, Black A8 (captures 4)
  2. Black D8, White A8, Black A7, White pass, Black A9 (captures 5)
  3. Black D8, White A7, Black A8 (captures 5)
  4. Black D8, White C7, Black A8 (captures 4)
  5. Black D8, White D7, Black A8 (captures 4)

Black has 5 legal points here and exactly one of them captures. White answers the others as shown and survives.

  • Black A8, White answers at A7 and lives.
  • Black A7, White answers at D8 and lives.
  • Black C7, White survives even by passing.
  • Black D7, White survives even by passing.