Tsumego Hero
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  • Black to kill. (No Ko)
    Sprint Intuition Rejuvenation Refinement
    8k (69.2%)
    File by Joschka Zimdars

    Rene Villarreal:
    @raytsh, it isn't ko because black can never atari from the outside. Trying it is self-atari. Therefore it isn't a real ko because white can leave it until the end when there are no ko threats and only then remove the stones from the board. It is the same concept that makes a bent-four in the corner dead.
    15. July 2021
    Why is blocking at the 1-2 point a valid solution if it says "no ko"? B is not dead and can tenuki. If W takes to kill then, it is ko.
    13. July 2021