@1000millimeter ranked choice (preferential) voting is also called “instant runoff”.

Voters number the candidates 1,2,3 etc using paper ballots with boxes for each candidate. First preference votes are counted. If any candidate has more than 50% of the vote in first preferences, they win (obviously). If not, the candidate with the lowest number of votes is eliminated, and their ballots are distributed to the next remaining preference (if any) on each ballot. If this distribution of preferences pushes one candidate past 50%, we have a winner. If there is still no winner after a round of preference distribution the process repeats, eliminating the lowest remaining candidate each time.

https://youtu.be/bleyX4oMCgM