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How can I get the Lichess pieces onto chess.com?
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Go to your profile. The easiest way is to click on the Chess.com logo on the top left of your screen.
Enter on the settings. It would be an gear icon on the top right of your profile page. It will have an letter icon (Messages) on the right side of it.
On the settings go to Board and Pieces. There, put both the board and the pieces with the theme called "bases".
I downloaded the extension “Skin Chess.com” but it is broken and in my opinion I like the Lichess pieces more than the chess.com ones.