Problem p199

한국어

within 2, 6 legal points

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

Stones to capture: 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 D7, White pass, Black A9 (captures 4)
  2. Black D7, White A9, Black B9 (captures 5)
  3. Black D7, White B9, Black A9 (captures 4)
  4. Black D7, White C9, Black A9 (captures 4)
  5. Black D7, White D9, Black A9 (captures 4)
  6. Black D7, White D8, Black A9 (captures 4)

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

  • Black A9, White answers at B9 and lives.
  • Black B9, White survives even by passing.
  • Black C9, White survives even by passing.
  • Black D9, White survives even by passing.
  • Black D8, White survives even by passing.