caranthir: It used to say at the end that "you get 10 000 years ko and sente" and that the opponent's last move was necessary to prevent oshi-tsubushi. That was not the case, we would've needed still one liberty more for that. Therefore I also removed opponent's last move (not forcing, not needed to prevent oshi-tsubushi) for more realistic opponent behavior.
posetcay: B2 should be at A3, otherwise B2-A3 is just dead.
caranthir: Not dead, we have C18 still. I'll make B18A17 an alternative response. Moreover I'll add A17 as an alternative to B18. It is a little better anyway.
TwT: [current position]
By clicking on message below appears "Link current position". Clicking there puts a neat icon in the message linked to the position you are refering to. Is the one above the one you are relating to?
TherapieGo: Incredible plot twist for this problem ^^
Can B also simply play A17 after W B19? W must connect to C19, B can directly Tenuki and the status is the same or seki ?
TwT: Hi TherapieGo,
Welcome back! Your return brings me a well balanced emotion between happiness and awe. I must admit, I haven't quite managed to clear the backlog you left behind yet. To make the most of your valuable insights and unlimited competences and limited resources, I kindly ask you to consider two points: 1. Please use "Link current position" or "Proposal" to help clarify your suggestions. 2.Be more specific in your explanations. For example, "if play here and there it is seki or anything," That maybe insufficent to attract attention of any high dan admin. Thank you for your understanding, and I look forward to your insights! (See above)
promme: After white connect Q3, can black Q1 make it ten-thousand-year ko ?
https://senseis.xmp.net/?LongLGroup
guile: I agree. Without an additional external lib, B cannot oshi-tsubushi after the D1E1B1B2 exchange and must accept the tenThousandYearKo and gain sente in doing so because A5 is necessary. If Ivan Detkov confirms that the tsumego will be updated.
AtariAnyone : sorry in addition to my previous message this is of course assuming black starts with D3 and then white counters with D1. (bottom left orientation black to play)
Ivan Detkov: How about D3D1E1B1C2? Looks like seki to me.
AtariAnyone : bottom left orientation if white starts with D1 we cannot avoid ko as far as i can see, this also matches with my cross-check on sensei library for Long L group with hane.
sequence: D1E1B1B2C1A3A5
kovarex: I changed the problem to be status based, and then it changed one of the varitations which was seki to be wrong (when there is other which is alive and alive is better then seki).
Also, I added alternative white answer of the clamp, which is important to understand this problem and meaning of the hane, as without the hanne, it is 10 000 years ko, but with hane, this move doesn't work. (I added notes of it in respective variations).
Let me know if I made a mistake.
posetcay: Q17-S19-T17 becomes disadvantageous ko so I fixed that branch and changed Q17-S19-Q19-R18 to Q17-S19-Q19-T17 because I think it is a stronger resistance, other than that looks good.
promme:
Not dead, we have C18 still. I'll make B18 A17 an alternative response. Moreover I'll add A17 as an alternative to B18. It is a little better anyway.