Problem p071

한국어

within 3, 6 legal points

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

Stones to capture: A9, A8, A7, B7, C7

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

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

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