Tsumego Hero
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  • White to kill.
    Sprint Intuition Rejuvenation Refinement
    2d (27.9%)
    File by Silent Gentleman



    posetcay:
    After B18, if w A18, isnt this ko?
    caranthir:
    Yeah, you're right. Somehow I've overlooked the simplest way so far, the simplest way being that defender can force a ko. Updated. Sorry that this is starting to become a bit messy.
    9. November 2021
    10:48
    stone_juggler:
    caranthir, I believe after B18 A17 C18 D17 F19 B19 A18 E19 C19 G19 F17 defender could just go out H18 since there no attacker's stone outside. Attacker is also in loss of liberties inside, so defender could return later and capture inside stones when he would heve enough liberties outside. Or, at least, defender could make an eye outside and it will be a seki.
    caranthir:
    Thanks. It seems that there should be some extra stone in the side to help attacker refute the running out situation. Modified the problem accordingly.
    30. October 2021
    15:15
    stone_juggler:
    In the main variation after w B18 A17 C18 D17 F19 black would play B19 instead of E19 and will live
    caranthir:
    After defender B19, attacker should play A18. Now C19 and E19 are miai to kill. If E19, C19, G19, then F17 and defender is in loss of liberties to approach inside stones.
    30. October 2021
    05:37
    stone_juggler:
    After B18 B19 A18 A17 I cannot find any way to kill the corner
    caranthir:
    After your sequence, C18 ate, D17, F19. Now C19 and E19 are miai to kill.
    30. October 2021
    04:49