Gokyo Shumyo, Section 1, Problem 71 / Attempts

My best bet  

Nando: OK, I gave it a try (for my double-digit kyu strength, this Kanazawa series is quite tough and so, highly interesting). It seems to me that Black 1 does the job (well, this only means that I haven't been successful in finding a killing attack for White...)

A white try  

For instance, Black 3 makes miai of a and b for life.

another one...  

Here, White 4 can't escape. (By the way, is this an example of oiotoshi?)

unkx80: Yes, this is oiotoshi. And I think your solution is OK.