And another thing I discovered about the value of the joker. It matters also how many pieces the opponent has. Imagine on a 10x10 board (where I had measured that the chancellor and gryphon are equal, and also it is known that the RN and the BWN are also equal) and endgame with king, joker, gryphon, chancellor and the BNW against king, joker and 3 chancellors. The side with the more diverse pieces has an advantage. There is a lot of consideration to be put into this I'm afraid.
Good luck!
@Greg,
And another thing I discovered about the value of the joker. It matters also how many pieces the opponent has. Imagine on a 10x10 board (where I had measured that the chancellor and gryphon are equal, and also it is known that the RN and the BWN are also equal) and endgame with king, joker, gryphon, chancellor and the BNW against king, joker and 3 chancellors. The side with the more diverse pieces has an advantage. There is a lot of consideration to be put into this I'm afraid. Good luck!