Tsumego Hero
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  • White to live. (No Ko)
    Sprint Intuition Rejuvenation Refinement
    8k (66.9%)
    File by Joschka Zimdars

    After E19, isn't E17 seki? And if seki is acceptable here, why are D18 or E17 not acceptable solutions as well? I don't see how the attacker gets any better than seki in either case.
    If D18, then E17 kills. If E17, then D18 kills. In either case, we cannot prevent the attacker from almost-filling the space with a bulky five nakade (attempt to do so would be self-atari). If there were any outside liberties, it would be a different story.
    26. December 2021