Tsumego Hero
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  • Black to kill.
    Sprint Intuition Rejuvenation Refinement
    6k (60.8%)
    File by Bradford Malbon

    B S2 is the only necessary move because (no ko) is not stated in the problem
    "No ko" means that the killing must be unconditional and not depend on winning a ko using some imaginary non-local ko threat(s). Therefore if S2, T2, the attacker must then continue with S1 in order to prevent ko.
    8. July 2021