Tsumego Hero
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    White to kill.
    		Sprint Intuition Rejuvenation Refinement
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    File by Innokentiy Zabirov
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    • caranthir:
    @Farkas In the SGF I tried to show that white is already alive in seki after b D18, w C19, b E19, and the sequence is therefore a failure (in gote even) for black. Adding w E17 after that gains nothing for white. The problem was incorrect before in that b D18, w C19, b E19 was shown to be a success for black (which was the whole point of my demonstration), but was thereafter fixed.
    Farkas:
    Thank you.
    		8. June 2020
    20:50
    caranthir:
    SGF
    Farkas:
    E19 and E17 are miai - after b E19 (in your solution), white shouldn't tenuki, but play E17 and live with seki.
    		29. May 2020
    07:24
    caranthir:
    After b D18, w C19, b E19, the space is one too large to be reduced to hana-roku, so w lives still. (SGF)
    Neri:
    Your moves have been added.
    		29. May 2020
    07:24
    Nicolas:
    I think that black can also play O2 or P3 instead of P1 for the last move (even if white's ko threat is less good in case of P1)
    d4rkm4tter:
    Your moves have been added.
    		18. February 2020
    19:20