Full Idea
Reliabilism would count pure guesses as good reasons if guessing were properly reliable.
Gist of Idea
If pure guesses were reliable, reliabilists would have to endorse them
Source
Earl Conee (First Things First [2004], 'Getting')
Book Reference
Conee,E/Feldman,R: 'Evidentialism' [OUP 2004], p.20
A Reaction
See D.H. Lawrence's short story 'The Rocking Horse Winner'. This objection strikes me as being so devastating that it is almost conclusive. Except that pure guesses are never ever reliable, over a decent period of time.