Board Game Arena

I think you are wrong springiest since I believe it's a difference between convention's sets.
I will rewrite it nicely:

Played: r1
Bob: b1-x-x-x
Cathy: ?-?-?-?
Donald: x-r3-r1-x
Alice clue 3 to Donald.
Bob plays b1.
What should Cathy do?
What should assume Donald if Cathy doesn't play?
What should assume Donald if Cathy play?

both very easy questions!

if cathy does nothing, donald assumes he has r3 exactly.
if cathy plays (say a g1), donald assumes he has any 3 except r3 or g3.