Can you help me?

[Sun1Plus]

I'm doing my graduation design and want to make a go project. When I read you code , I have a problem: in michi code, there are 4 characters "X, O, x, o", the note says "X,O are colors, x,o are their inverses", I can't know what is "inverses", can you help me?
Thank you for your work!

[pasky]

I don't think there's any note like that in michi's source code. In the board data structure, we use 'X' and 'x' (for the to-play player and the other player). In board visualization, we use 'X' for black, 'O' for white.

[Sun1Plus]

Thank you very much. I know it!
I usually encouter an " AttributeError: 'NoneType' object has no attribute 'n' "
when I debug used mcdebug() and mcbenchmark() .
Could I get you email and sent you a screenshot?