The shoe insert has actually been built, though I haven't heard if it, or something similar, has been used in real cheating yet. It's a shoe-to-Pi device calle

The shoe insert has actually been built, though I haven't heard if it, or something similar, has been used in real cheating yet. It's a shoe-to-Pi device called Sockfish (a pun on the Stockfish chess engine): https://incoherency.co.uk/blog/stories/sockfish.html https://incoherency.co.uk/blog/stories/sockfish.html