Problem p102

한국어

within 3, 5 legal points

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

Stones to capture: B9, C9, D9, C8, D8, 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 B7, White pass, Black D7, White pass, Black A9 (captures 6)
  2. Black B7, White A9, Black A8, White pass, Black D7 (captures 7)
  3. Black B7, White A8, Black D7, White pass, Black A9 (captures 6)
  4. Black B7, White A7, Black D7, White pass, Black A9 (captures 6)
  5. Black B7, White D7, Black A9 (captures 7)

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 A8, White survives even by passing.
  • Black A7, White survives even by passing.
  • Black D7, White answers at B7 and lives.