One method I can think of immediately (when playing face-to-face in the same room) You carry some device which lets you input data, computes the best move, and

One method I can think of immediately (when playing face-to-face in the same room) You carry some device which lets you input data, computes the best move, and actuates that response back to you. Let's say that this device is simply a very small microcontroller which takes in input via some pressure sensor, and outputs via some actuator that creates vibration. You've loaded some chess program onto that microcontroller. You hide the device somewhere on you, tape the input pressure sensor to your thigh, and paint / cover up the sensor and wire with material similar to your skin. Same with the output actuator. When it is your turn, you input the current state of the board via the pressure sensor. Input sequence is sent to the program, which calculates best possible move. The output actuator vibrates the sequence of what piece, and where to move. Probably one of the older tricks in the book, as far as device-guided heating goes.