The run-off vote in Georgia is for the US Senate. For last Tuesday's election, there were more than 2 candidates:
Raphael Warnock (Dem) 49.4%
Herschel Walker (GOP) 48.5%
Chase Oliver (Libertarian) 2.1%
The run-off election will be between the top 2 finishers, Warnock and Walker – in January. This is one good reason why Ranked Choice elections would be better. No need for a run-off election.
In Ranked Choice, voters choose their 1st, 2nd, 3rd choices, etc., all in one election. If no one gets more than 50% in the first vote tally, the last finisher is eliminated, and a new tally is added up. Votes for an eliminated candidate get added to the tally of the remaining candidates as the voter had previously instructed. For example, in Georgia, 2.1% of the votes went for Oliver in the 1st tally. In the 2nd tally, those 2.1% of the votes get distributed among Warnock and Walker as those Oliver voters had chosen for their 2nd choice. Warnock wins if he gets more than 0.6% of those Oliver votes, and Walker wins if he gets more than 1.5% to win. It wouldn't take long to know the results.
One of the major problems we now have with primary elections where each party selects a single nominee for the November election, is that it tends to favor candidates from the extremes of a party. Lately, the GOP has suffered losses in November because they choose extreme right-wing candidates in the primary election. If Ranked Choice gets used in primary elections, it would tend to favor centrist candidates over those from the extremes. Personally, I'd like to see more of that.