Tsumego Hero
  • Black to live. (No Ko, no Seki.)
    Sprint Intuition Rejuvenation Refinement
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    Leo Wagner:
    black e2 - white c1, black e1, white b1, black e1, white c2 doesn't seem to kill the shape to me. What's going on?
    caranthir:
    There's a mistake in your sequence, you say "black e1" twice. I'm assuming that on the second occurrence you meant "black d1". In that case it's alive, but in seki (mutual life) with the inside group of attacker's stones. (The hint in this problem disallows seki.) That means that you cannot possibly try to capture those attacker's stones without getting killed yourself, but at the same time, the opponent cannot do anything to capture you either. Since no-one can't possibly remove any more opponent stones, the empty intersections inside will for all eternity _not_ have a path to a single color and single color only; therefore those intersections will be no-one's territory at the end of the game if the position stays like this. That, in essence, is seki.
    5. May 2022
    19:14
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