What is the strongest chess engine working on Arduino (Atmega328)? What is the strongest chess engine working on Arduino? Or does any engine work on it?
Not every chess engine works on Arduino as it doesn't run a conventional *nix operating system.

There's a list of chess engines that do work here:

http://chessprogramming.wikispaces.com/Arduino

Updated url from Fabian's comment:

https://www.chessprogramming.org/Arduino#Chess_Programs