Does anyone know how I can make an online playable variant or how I can suggest it or something like that?
P.S. The variant I have in mind cannot be created with chess.com's custom variant thing.
Learn to program, if you don't already know how, then get the lichess source code(it is open source) and make a modified server that people can play your variant on.
Be warned that lichess is mostly written in Scala, which isn't the easiest language to learn, but if the changes to the rules are not too large, it should be practical to change one of the existing variants to have your new rules without having to fully understand what the code is doing.
Probably simplest way would be to fork the Lichess code from GitHub, and program in your variant. Several sites already exist on this basis (PyChess, Lidraughts, LiShogi).
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