Used to be that although standard members only had access to the last month of games in their archive, the games weren't lost, and upgrading gave you access. I do not know if that is still the case, but I'll see if I can find a help article for you.
Upgrading to premium and the explorer
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Looks like you can find them all with the Explorer. Have fun!
https://support.chess.com/article/687-how-do-i-explore-my-own-games
Hello
So as a basic player I can't use the explorer on my games. My question is does anybody know if I go premium will I be able to analyse the games I've played to this point or are they lost to time?