Tsumego Hero
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    		Sprint Intuition Rejuvenation Refinement
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  • 21

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    heron:
    posetcay: your comment doesn't make sense to me. It is not defender's turn. S2 T2 T1 Q2 P2 R1 doesn't seem living to me.
    posetcay:
    S2 T2 T1 Q2 R1 is alive.
    		3. May 2024
    05:38
    heron:
    I think d4rkm4tter is right, I can't see how to live unconditionally after S2 T2 T1 Q2. Should it be removed?
    posetcay:
    R1 lives unconditionally.
    		2. May 2024
    03:48
    caranthir:
    SGF
    		28. May 2020
    16:47
    caranthir:
    I can't see how w is alive after said sequence B18, A18, A19. AFter b takes with B19, it seems to me that at best w will have a ko shape.
    d4rkm4tter:
    Difficult! Here is what I found: The sequence B18-A18-D18 which was previously marked correct is wrong. However, the sequence B18-A18-A19-B19 is indeed a living shape. You checked to expand the eye space by continuing with D18 or B15. This creates an empty triangle when you would try to capture the inside stones. You can though live with C19 or A18. This sets up a double atari and the player is alive unconditionally. The key to this problem was avoiding an empty triangle which reduces liberties.
    		28. May 2020
    16:46
    TherapieGo:
    Hi, problem 21 "In-seong's Lectures" is a mistake since White can live without the double ko. If White plays B18 and Black answers A18 White plays A19 and it is alive unconditionally. Double ko is not 100% unconditional.
    Admin:
    Your move(s) have been added.
    		18. June 2019
    09:31
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