Problem p072

한국어

within 2, 5 legal points

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

Stones to capture: D9, C8, D8, B7, C7, D7

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 B8, White pass, Black C9 (captures 6)
  2. Black B8, White A9, Black C9 (captures 6)
  3. Black B8, White B9, Black C9 (captures 6)
  4. Black B8, White C9, Black B9 (captures 7)
  5. Black B8, White A8, Black C9 (captures 6)

Black has 5 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 B9, White survives even by passing.
  • Black C9, White answers at B9 and lives.
  • Black A8, White survives even by passing.