"In November, when voters elect three City Council members from each of four large districts, they will do so with a version of ranked-choice voting not used in any other U.S. city.
Voters will be allowed to choose up to six council candidates in order of preference, and candidates will only need 25% of first-, second- and potentially even third- and fourth-choice votes to win."
Ah. STV isn’t particularly complex to understand, either at voting or calculation time. It’s a decent choice for multi-winner elections, which it sounds like the Portland election is.