Tsumego Hero
  • White to live. (Thousand year ko)
    Sprint Intuition Rejuvenation Refinement
    1d (2199)



    posetcay:
    Stopped the sequence at A19 to avoid confusion.
    6. July 2025
    20:21
    simpleTom:
    I think the topic of the last move could be avoided with a comment/question, if Tenuki is possible or another move is required. I made a proposal.
    6. July 2025
    19:24
    Sadaharu:
    Finally got it... ^^
    caranthir:
    Great! I'll delete our related messages from the other problem, so as to not spoil the "fun" from others :)
    9. June 2021
    16:18
    Sadaharu:
    Isn't it already thousand-year ko up to the sequence of T19 atari? Why need to continue playing after that...?
    caranthir:
    I think that playing elsewhere at some odd point, after forming the mannen ko, is in this problem (and in at least one other) a way to indicate that the player "understands" that the position should be left as is. Other way would be some kind of pass or "tenuki" button, but those are not implemented in Tsumegohero. Moreover, every correct sequence in Tsumegohero must end in player's move. Within the framework at hand, the final required move should be here either the capture at T18, or a "placeholder" move after opponent's subsequent ate, as is done here.
    8. June 2021
    18:34
    Sadaharu:
    Isn't it already thousand-year ko after the sequence up to B's atari at T1? Why does W need to keep on playing?
    caranthir:
    See above.
    8. June 2021
    18:28
    thepope:
    The last move is really confusing, how can you tell which moves are valid "passes"? Bottom left orientation, J3 is not valid, and I suspect many others are not valid as well. There's no "natural" move locally. I think either every visible intersection should be valid, or maybe add a "natural" tenuki like a capture or something
    d4rkm4tter:
    I added a hint.
    1. October 2020
    05:07
    Careenium:
    I know this is a one thousand years ko, but I have no idea how to tell that to the problem in the last move. Isn't the best move to not play there?
    Farkas:
    you can play elsewhere
    28. September 2020
    23:16
    Polat Fevzi Dundar:
    I tried everything. Are you sure there is a solution? I ve found Ko.
    Farkas:
    There is a solution, which is labelled "correct".
    2. September 2020
    05:41
    StephaneLamy:
    It is strange that S13 is accepted as good answer for the last move, but not T15. Seems the site would need a "pass" or "tenuki" option. Or add an indication "use S13 if you wish to tenuki"?
    d4rkm4tter:
    I added T15.
    20. June 2020
    14:07
    totbeibrot:
    thats a 1000-years-ko. black shouldnt start the ko and instead tenuki
    Farkas:
    I agree, it's a mannen-ko (10.000 year ko), and better for B to tenuki. Actually, playing inside is a mistake, therefore I added sequences and changed the ending.
    1. February 2020
    02:29
    searching...