How to provide identification of a nearby object + power supply (no more than 20mA) without wires?

Question

NFC

Question on the example of chess.
1. You must always know exactly where the pieces are.
2. There are consumers in these figures, not more than 20 mA. We must feed.
3. Everything without wires.
What is the best and cheapest way to solve the problem?
I am looking at NFC and Qi, but have not yet figured out how to approach the issue.

Answer 1

In the heading about identification, in the text about determining the location ...
NFC technology is not intended for wireless charging.
With such an indistinct TK, the answer will be as follows:
On the example of chess, place a separate reader / charger under each cell, which will identify (and wirelessly charge) the figure standing above it.