Problem 3:
Problem 3 Attempt:
Hikaru79's Guess
My guess is a, since b will help your opponent surround the top right group. If ,
,
, then the group is almost certainly doing fine, white's two-stone group is hanging, and the circled stones have a base.
white's corner isnt alive yet either
Very good Hikaru79. Notice how the shape looks a lot like problem 1.
Got a new one :)