Which preposition to use with guessers

in Occurrences 2%

In this city, a lineal descendant of the Prophet, and a lucky guesser in the way of divining, are the essential ingredients in the composition of a Moorish saint.

as Occurrences 1%

I have to guess, and I'm not a lucky guesser as a rule.

at Occurrences 1%

But you know I am a very inexact guesser at measures and distances, and may be mistaken in many miles; and you know how little I have attended to these airgonauts: only t'other night I diverted myself with a sort of meditation on future airgonation, supposing that it will not only be perfected, but will depose navigation.

of Occurrences 1%

" "You are a very bad guesser of secrets," whispered Hermione in return.

Which preposition to use with  guessers