Problem p150

한국어

within 3, 5 legal points

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

Stones to capture: B9, C9, D9, B8

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 A7, White pass, Black C8, White pass, Black B7 (captures 4)
  2. Black A7, White C8, Black B7, White pass, Black C7 (captures 5)
  3. Black A7, White B7, Black C8, White pass, Black C7 (captures 5)
  4. Black A7, White C7, Black C8, White pass, Black B7 (captures 4)
  5. Black A7, White D7, Black C8, White pass, Black B7 (captures 4)

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

  • Black C8, White answers at A7 and lives.
  • Black B7, White answers at A7 and lives.
  • Black C7, White survives even by passing.
  • Black D7, White survives even by passing.