Igo Hatsuyo-ron Problem 141 / Attempts

White to play  

Karl Knechtel: This general idea, I think. But the semeai is a bit complicated...

Continuation?  

Actually, I guess the marked White stone should go at a instead... anyway, if Black doesn't play , it seems like either it will reduce to the same semeai, or else Black fights a rather unfavourable multi-step ko.