Problem p185

한국어

within 3, 5 legal points

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

Stones to capture: B8, C8, B7, C7, D7

Black to play.

Why this is the move

White has 4 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 D8, White pass, Black A7 (captures 5)
  2. Black B9, White D9, Black D8, White pass, Black A7 (captures 5)
  3. Black B9, White D8, Black D9, White pass, Black A7 (captures 6)
  4. Black B9, White A7, Black D8 (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 D9, White survives even by passing.
  • Black D8, White answers at B9 and lives.
  • Black A7, White answers at B9 and lives.