Competitive Duels
Pretty sure my latest duel didn't give me the 10 points or registered it as a win, even though I won. I think I should be at 8/9 wins, but I don't believe there is a way to double check. It lasted like 15 rounds, I don't know if that had something to do with it. If it happens again I will screenshot the result, it even said +0, but I closed it too fast.
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Look for links starting with https://www.geoguessr.com/duels/xxxxx (xxxxx being the duel ID) that would match the time you played.