I want to know the answer to the following question:
What enforced contest rule guaranteed that neither gender nor social rank would determine the judging?
All the background I'm provided with is that "Indeed, although the "vast majority" of participants belonged to the wealthier strata of society ("the liberal arts, the clergy, the judiciary, and the medical profession"), there were some cases of the popular classes submitting essays, and even winning.". Is that enough to answer the question?