You can vote your conscience in round 2 only. In round 1, your best strategy is to only vote for one of the top three frontrunners, so you don't waste your vote

You can vote your conscience in round 2 only. In round 1, your best strategy is to only vote for one of the top three frontrunners, so you don't waste your vote. And suppose your favorite frontrunner would probably lose a head to head contest with your third favorite frontrunner. Then you may want to vote for your second favorite frontrunner, to make sure she gets into the runoff and has a chance to defeat your #3.