Next version of MAME will support chesspieces for the electronic chess games again. The old external artwork won't work as-is. Input/output tags will need to be modified. You can use the internal artwork for reference.
In the few past years, while MAME stopped supporting chesspieces(due to source file licensing troubles), CB-Emu, Franz Huber's fork of MAME, did continue. People have made external artwork for that too. for example here: http://foro.meca-web.es/viewtopic.php?f=19&t=1219
I made a proof-of-concept artwork, converting Volodymyr's artwork for Designer 2100 Display. https://tsk-tsk.net/net/extart/fdes2100d.zip screenshot: https://imgur.com/a/zRpYdwM
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