IM Eric Rosen's "Beginner to Master Speedrun" (https://www.youtube.com/watch?v=nG-n3rNA2VM&list=PLdT3OotRiHJkaRjrG0GSfaddcf0cDyqhn) has him climbing the rating ladder on chess.com. He went 100-0-0 in his first 100 games. What rating range will the opponent be in who draws or beats him for the first time? This refers to the opponent's rating before the game. If a draw or loss happens for reasons not related to the game itself (e. g. forfeit due to internet disconnection), this does not count. A loss on time does count. Mouseslips also count. Resolves as "Other" if Eric ends the speedrun unbeaten. Closing date of the question will be extended if necessary.

Edit: I won't count draws / losses if it is clear within the same episode that the opponent was cheating, i. e. if Eric shows that the person was banned or that his rating loss for the game was refunded. Eric suspecting an opponent of cheating isn't relevant. Revealing the cheater has to happen within the same episode so that I can resolve the market without having to come back to it after later episodes.