To play dice chess, you need a chessboard. On each player's turn, they click "Roll!" and they will get 3 pieces. For example, if they roll a pawn, a pawn, and a bishop, they move a pawn, another pawn, and a bishop. If they can't move one or more of the pieces, they don't. You can move the same piece twice. If you roll triple queens, for example, this can be super useful. You move the queen in a place it can give check, give check, and then take the king. Speaking of that, there are no checks, checkmates, or stalemates. Just taking kings. (And lastly, yes, you can do triple en passant)
I learned about this variant in a video by "iwantcheckmate".