Tsumego Hero
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    Sprint Intuition Rejuvenation Refinement
    4k (49.32%)
    File by Silent Gentleman

    I disagree with ogee. This way it's seki.
    I agree with semelis. It's gote seki for the attacker when after B19, defender leaves the position as is. I kept the variation, though, because if attacker is lacking ko threats, then the option "gote seki but leaving defender the option to live with points before the external liberty is removed but in a ko for life where attacker takes first" could be optimal.
    23. July 2021
    A18-B18-C19-D19-B19 is ko (kinda bent four with 1 liberty) but it is better because attacker takes first.
    Your move has been added.
    20. October 2020