We can split our project into three challenges:

Recognize the position of the pieces:

For the first challenge we drill the base of each piece in order to attach a magnet to each of them. The data acquisition will be performed with the reed switches under the board, if there is a piece over the square, the sensor is activated and esp32 will receive VCC. To make it possible for ESP32 to read all sensors we will use four Mux 16 to 1.

Generate the PGN file:

The code that interprets the position of each piece and exports the PGN will probably be developed in microPython (due to the amount of libraries available for chess). Since our system does not allow for piece identification this could be a little challenger.

Analyze the match:

We will use the stockfish engine to analyze the games in real time. Stockfish is a amazing opensource engine that runs well in any smartphone.

Well, this is my undergraduate final project and I intend to post the complete project here (with the code), but for that we need the PCB, which is quite expensive...