KendoKa? This is the solution I found... White can't tenuki on 3 and if white want's to kill at 7 neglecting 5 he will die in a ladder ;)
KendoKa? Can white play 8 at 9 ?...
Herman Hiddema: Yes. If white plays at
and black tries to capture with a, black will lose the semeai because his corner group only has 3 liberties, the
exchange is a mistake.