Howdy!
A couple of life and death problems ...
Problem a: White moves, black dies (5-7 kyu range)
Problem b: Black moves, black lives (relatively easy - 15-20 kyu?)
Source:
I found problem "a" while working through Maeda's Life and Death (elementary level), by Maeda Nobuaki. Interesting problem!
The diagram created as always courtesy of online software by Jansteen at: http://www.cwi.nl/people/jansteen/go/ )
Solutions, comments, and discussion welcome.
Enjoy!
mikehansen