There's already been a well known Guess the ELO website for years
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with this brand - new 1 day-in-the-making low-budget site you can play guess the elo!
I am still working on it, so If you want to submit games here in the fourms feel free to do so!
please note that in the games you may not be completly winning at the start and the game has to last at least 30 moves. you can find the site here: https://sites.google.com/view/guess-the-elo/gte1