Regarding the sensorboard interface for all the chessdrivers: MAME used to have support for it but it got removed when we couldn't contact the copyright holder during the big open source license change. It wil make all the chess games with electronic board playable (and more user friendly than it was before it was removed). I hope its usage is intuitive, more detailed notes here: https://github.com/mamedev/mame/blob/master/src/devices/machine/sensorboard.cpp#L32
The chess piece icons for internal artwork are supplied in the 'artwork' folder. It will work by default, but if your mame.ini doesn't have this folder in its artpath, add it:
eg. change: artpath c:/mycustomfolder
to: artpath artwork;c:/mycustomfolder
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