it is difficult to be a participant and juror at the same time.
But technically, not really. All you gotta do is vote honestly as if you did not enter the contest. If everyone that participates in a contest honestly voted for the chops they feel they should vote for, then the winner would win because he had the best chop. Not because he held back his vote from someone who might have beaten him.
That sounds great, and it should be the 11th commandment, but it just ain't gonna happen, we as humans are pretty fallible.
Do as your conscience tells you. but there are unconscionable people out there.