Developing the AI of a chess agent

[oliver]

So i am willing to develop the AI part of a chess engine by using reinforcement learning.
I want to focus on the AI part so i would like you to propose to me a good open source(written in Java) chess engine that i can modify.
It is best if it is compatible with Arena 3.5.

Thanks in advance.

[kinderchocolate]

Why can't you just use Stockfish? What TD(leaf) do you want to use?