Magnetic chess question I'm a maker and I'm doing my own chess board. 

I want the board to be able to sense where are the pieces located, so my idea is to use magnetic sensors and magnetic pieces.

I would like to just ask a simple question: In the existing magnetic chess sets that one can find everywhere, is the board magnetic and the pieces just contain metal or the opposite (each piece has a magnet and the board is just a metal layer)?

Could somebody who has a magnetic chess set check?

Thanks.
Magnetic chess sets have a metallic board and small magnets in each of the pieces.