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A perfect solution alerting about promotioncould be to change the color (red?) of the pawn or piece who could be promoted up to the moment we confirm our move.
That could not hurt the purist, I think, because in an online Japanese club we are alerted through a little box appearing on the board
(hide) If you are waiting for your turn, click on "change" next to the "refresh" on the main page, then set refresh the page to 30 seconds to get your turn to move displayed faster. (Servant) (show all tips)