Elected leaders and voters in New York remain split over the ranked-choice system, but officials in Washington and elsewhere like the results. The most high-profile experiment in ranked-choice voting in U.S. history just took place in New York City. The reviews are mixed.Hundreds of thousands of voters ranked up to five candidates on their ballots in the Democratic primary for mayor, and many were glad to have that option. Others found the system confusing or wished they had been more strategic in making their choices.Some elected officials want to scrap the system because they believe it may disenfranchise Black voters, among others. But for now, it appears, ranked-choice voting is here to stay. Eric Adams, the winner of the Democratic mayoral primary, saw his lead over the second-place candidate shrink from 75,000 votes to only 7,197 after ranked-choices were counted, and he attacked two of his rivals for campaigning together in the race’s final days to try to beat him. One of Mr. Adams’s allies, Councilman I. Daneek Miller of Queens, is promoting a bill that would let New Yorkers decide whether they want to keep ranked-choice voting, although there does not appear to be enough support among his colleagues for it to be approved.“You see these large leads dwindle because of voter rankings,” Mr. Miller said. “Is this an exercise in mediocrity? Do we want fourth- and fifth-place votes deciding leadership?”This year’s primary was the first time New York had used ranked-choice voting in a citywide race. The system is used in other countries and in cities like San Francisco, but it had never been attempted in a larger American city. Other places, including Washington D.C., the Seattle area and Lansing, Mich., could move to adopt the system. Christina Henderson, a member of Washington’s city council and a supporter of a bill that would bring ranked-choice there, said the New York election showed the system’s benefits, including the diversity of winning candidates like Mr. Adams, who is likely to become the city’s second Black mayor.“Races are more dynamic and collegial with genuine policy debates supplanting negative campaign tactics,” Ms. Henderson said.The new system changed how some candidates campaigned for mayor, encouraging them to appeal to their rivals’ supporters to earn a spot on their ballots. By striking a late alliance with Andrew Yang, for example, Kathryn Garcia won over many of his voters.But a major snafu by the city’s perennially dysfunctional Board of Elections — accidentally releasing an inaccurate vote count — could undermine confidence in the system. And although Mr. Adams won the primary, his allies have raised concerns that ranked-choice voting could hurt Black voters who might choose only one candidate. Some Black leaders sued last year to try to stop the system from being introduced.Mr. Adams himself has criticized how ranked-choice voting was rolled out, but he does not want to eliminate it. He said it was an obstacle for some voters and called for more education about it. “Your New York Times readers, your Wall Street Journal readers and all of those that had the ability to analyze all this information, it’s fine for them,” Mr. Adams said in a radio interview on WNYC this week. “But that’s not the reality when English is a second language, that’s not the reality for 85- and 90-year-old voters who are trying to navigate the process. Every new barrier you put in place, you’re going to lose voters in the process.”The system’s supporters have defended it vigorously, arguing that voters did understand how to use it. Maya Wiley, who finished third in the Democratic mayoral primary, wrote a piece for The Washington Post in support of the system despite losing. Ranked-choice advocates say the system helped improve the fortunes of female and minority candidates. The City Council appears poised to have its first-ever female majority, and women finished second and third in the mayoral primary. “We won’t let anyone take away the people’s voice and go back to the old system where costly, low-turn out runoff elections actually disenfranchised people,” said Debbie Louis, the lead organizer for Rank the Vote NYC, a group that supports the voting system. Some voters did not like the new approach. Rebecca Yhisreal, 61, who lives in West Harlem, said she voted for Mr. Adams first and ranked three other candidates on her ballot. But she said she preferred the old system, under which New Yorkers voted for one candidate and if no one got more than 40 percent of the vote, the top two finishers would go to a runoff. “It was kind of confusing,” she said. “I would rather it go back to how it was.”William Brown, a retiree who lives in Harlem, said the crowded mayoral ballot, which had 13 Democrats, had made it difficult for him to make sense of each candidate’s positions and to determine how to rank those he liked best. He said he had ranked Raymond J. McGuire, a former Wall Street executive, first, and had forgotten how many other candidates he ranked.“It’s unfair,” he said. “You have to take the time to understand it, but there’s too many candidates. It’s detrimental.”Mr. Miller, who is in his final year in the City Council and testified at a State Assembly hearing this week with other critics of ranked-choice voting, said residents in his Southeast Queens district had complained to him about the new system. It encouraged voters to focus on the horse race between candidates rather than on issues, he said.Under ranked-choice voting, if no candidate gets more than 50 percent of first-choice votes on an initial tally, the process moves to an elimination-round method. The lowest-polling candidates are eliminated, with their votes reallocated to whichever remaining candidates those voters ranked next. The process continues until one candidate has more than 50 percent of the vote.Some voters expressed regret that they had not been more shrewd by picking between Mr. Adams or Ms. Garcia so that their ballot helped decide the winner. More than 140,000 ballots were “exhausted,” meaning they did not name either finalist and were therefore thrown out. Those ballots represented nearly 15 percent of the 940,000 votes cast, a higher rate than in some other ranked-choice elections. In London Breed’s 2018 mayoral victory in San Francisco, about 8.5 percent of ballots were exhausted. Advocates for ranked-choice voting say the share of exhausted ballots should decrease as New Yorkers become more familiar with the system.Mr. de Blasio, a Democrat in his second term, said he wanted to see more detailed voter data before deciding whether the system was a success. He said he would be concerned if the data showed wealthy voters ranking five candidates and poorer ones not doing so.“What I don’t want to see is a system that enfranchises some people and not others and we need the research to really tell what happened here,” Mr. de Blasio said.The city’s Board of Elections is planning to release detailed ballot information in the coming weeks that will reveal which neighborhoods took full advantage of ranked-choice voting. The information, known as the cast-vote record, will not be made public until recounts are completed in two unresolved City Council races. Corey Johnson, the City Council speaker, does not appear to favor doing away with ranked-choice voting. Asked about his position on Mr. Miller’s bill, Mr. Johnson’s spokeswoman said in a statement that New Yorkers had voted to create the system in 2019.“Nearly three-quarters of voters approved the new system,” the spokeswoman, Jennifer Fermino, said. “The mission now should be to help provide more education on this important change to our elections.”Many voters liked ranked-choice voting. In Brooklyn’s Bedford-Stuyvesant neighborhood, Andrew Wilkes, 35, a pastor and policy director for Generation Citizen, a nonprofit civic-education group, said he felt the system gave voters more choices and made it easier for candidates of color to enter the race. He ranked Ms. Wiley first among the five candidates he listed for mayor.“I found it pretty intuitive,” Mr. Wilkes said. More