#2 is Julia Collins and she won 20 games. Here's a great read.
https://fivethirtyeight.com/features/ken-jenningss-jeopardy-streak-is-safe-for-the-rest-of-time/
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Ken is a unique trivia flower
If you were to design a long-term “Jeopardy!” champion, he or she would probably be a lot like Jennings: someone who is not only incredible at trivia but also has the stamina to make it through a grueling schedule and can wrap up a game before it even reaches the final round.
Julia Collins, whose 20-game winning streak is second to Jennings’s, pointed to a cluster of five-, six-, and seven-game winners and noted that only 10 contestants have won more than seven games. “Jeopardy!” tapes up to five episodes a day, and while Collins was reluctant to hypothesize reasons for the cluster, she noted that most of those five-, six- and seven-time champs hadn’t had a chance to recover over a weekend.
Eleven-time winner Arthur Chu is more direct about why he couldn’t keep his streak going. “It was fatigue,” he said. “One of my opponents said I looked punch-drunk. … You could definitely tell I was making dumb mistakes.” Chu’s streak ended on the last day of taping for the week when he lost the second game of the day. “There’s a possibility that if I had won the next three games that day, I would have gotten over the hump,” he said. Taping would have resumed the following week.
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