Problem p165

한국어

within 2, 6 legal points

Black to play. Capture the marked white stones within 2 moves.

Stones to capture: A9, B9, A8, A7, B7

Black to play.

Why this is the move

White has 6 possible answers. Every one of them is listed below with the way Black captures. These are search results, not written commentary.

  1. Black C9, White pass, Black B8 (captures 5)
  2. Black C9, White D9, Black B8 (captures 5)
  3. Black C9, White B8, Black C8 (captures 6)
  4. Black C9, White C8, Black B8 (captures 5)
  5. Black C9, White D8, Black B8 (captures 5)
  6. Black C9, White D7, Black B8 (captures 5)

Black has 6 legal points here and exactly one of them captures. White answers the others as shown and survives.

  • Black D9, White survives even by passing.
  • Black B8, White answers at C9 and lives.
  • Black C8, White survives even by passing.
  • Black D8, White survives even by passing.
  • Black D7, White survives even by passing.