Which preposition to use with masterstroke

of Occurrences 2%

On the contrary, he believed it to be a masterstroke of cunning.

for Occurrences 1%

OLIVER, a favourite paladin of Charlemagne's, who, along with Roland, rode by his side, and whose name, along with Roland's, has passed into the phrase, a "Roland for an Oliver," meaning one good masterstroke for another, such as both these knights never failed to deliver.

Which preposition to use with  masterstroke