Problem p151

한국어

within 2, 5 legal points

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

Stones to capture: A9, B9, C9, C8

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 C7, White pass, Black B8 (captures 4)
  2. Black C7, White B8, Black B7 (captures 5)
  3. Black C7, White A7, Black B8 (captures 4)
  4. Black C7, White B7, Black B8 (captures 4)

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

  • Black B8, White answers at C7 and lives.
  • Black A7, White survives even by passing.
  • Black B7, White survives even by passing.
  • Black D7, White survives even by passing.