I closed my old account because I planned to play on a different website, but I decided to play here again. I had a platinum membership on my old account, and I was wondering if I could transfer it to my new account. It shouldn’t have expired yet.
You can contact support for that. It might just be easier top open your old account instead, but both ways require a ticket.
https://support.chess.com/article/346-contact-us
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