Well, if San Francisco's IRV races are to be used as an example, you end up with a one-party system. But more seriously, I think "clone-proof" electoral systems

Well, if San Francisco's IRV races are to be used as an example, you end up with a one-party system. But more seriously, I think "clone-proof" electoral systems tend to better allow for more than two parties, or at least more than two candidates at a time. https://en.wikipedia.org/wiki/Independence_of_clones_criterion https://en.wikipedia.org/wiki/Independence_of_clones_criteri...