These remind me a lot of DGT (digital transmission) chessboards, which are used to transmit the move of a pro game live to a website like Chess24. When received by the website, they’re displayed automatically onto an interface. I had always just assumed that because of the light stones and smaller playing spaces on a goban (DGT boards use the weight of the pieces to track the moves, afaik), the technology was simply impractical for use on them. But this has gotten me thinking again: why not make DGT gobans?
Let’s for a moment assume that weight-based DGT gobans would be impractical, so we’re left with magnetic DGT boards. For this, I have an idea: instead of painted metal stones, what about making the stones out of a mixture of glass and powdered metal? For instance, nickel with clouded glass for the white stones and brass with dark-tinted glass for the black stones? Hopefully those would have enough magnetism.