About Ko in a Semeai Between
Two One-Eyed Groups (2012)
Conclusion
The burden of this ko lies on Black, because he must not connect it. Black can use as ko-threats only moves, which threaten life for his top right group; White can allow herself merely occupying liberties of Black's group in the semeai. Both sides should prevent their opponent from building a larger eye (with more than two points). White's group on the left edge is a source of ko-threats for Black. White must answer Black's moves there as long as she cannot start the Punishment Semeai successfully. The best moment for White to start the ko is just before Black is forced to connect the hanezeki's tail. Black will try to connect the hanezeki's tail as late as possible (due to the potential semeai between White's enclosed group, and his - then connected - group in the lower right corner), White will try to force Black to connect the hanezeki's tail as early as possible. | |