Problem p156

한국어

within 2, 7 legal points

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

Stones to capture: B8, A7, B7

Black to play.

Why this is the move

White has 7 possible answers. Every one of them is listed below with the way Black captures. These are search results, not written commentary.

  1. Black B9, White pass, Black A8 (captures 3)
  2. Black B9, White A9, Black A8 (captures 4)
  3. Black B9, White C9, Black A8 (captures 3)
  4. Black B9, White D9, Black A8 (captures 3)
  5. Black B9, White A8, Black A9 (captures 4)
  6. Black B9, White D8, Black A8 (captures 3)
  7. Black B9, White D7, Black A8 (captures 3)

Black has 7 legal points here and exactly one of them captures. White answers the others as shown and survives.

  • Black A9, White survives even by passing.
  • Black C9, White survives even by passing.
  • Black D9, White survives even by passing.
  • Black A8, White answers at A9 and lives.
  • Black D8, White survives even by passing.
  • Black D7, White survives even by passing.