ArsenLapin: Hello, in the proposed solutions, the defender who is trying to live sacrifices a stone at R19 to start the ko, and as a result, the player who is trying to kill takes the ko first. However, the defender could play O19 instead of starting the ko. That threatens to make a seki, so the killer has to start the ko by sacrificing at R18, thus the defender takes the ko first.
twohalf: Hi, i've solved this puzzle, but from what i've read it should be ko But maybe i'm missing smth.
So for upper right position:
S19 and if Q19 is a response when of course corner die, but what whill happen if insted of Q19 the response will be Q18? I got this sequence:
S19 -> Q18 -> Q19 (can't put R19, because of seki) -> R19 -> R18 (starts a ko)
Am i missing anything?
d4rkm4tter: Yes, solution is ko. Q19 and S19 work as first move.
Hello, in the proposed solutions, the defender who is trying to live sacrifices a stone at R19 to start the ko, and as a result, the player who is trying to kill takes the ko first. However, the defender could play O19 instead of starting the ko. That threatens to make a seki, so the killer has to start the ko by sacrificing at R18, thus the defender takes the ko first.