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For my home set, I very carefully applied small (~1/8-inch) rub-on letters ("S", "G", "K", etc.) to the bottom right corner of each piece (other than the pawns, which I just left alone). I used lower-case letters ("g","d", etc.) for the obverse (promoted) side of all of them.
A nice result--a unobtrusive little reminder whenever needed.
(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)