Problem p016

한국어

within 2, 5 legal points

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

Stones to capture: A9, A8, B8, A7, B7, C7

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

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

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