Find out why black castles significantly more often than white in gene pools

[MarkZH]

No description provided.

[MarkZH]

Test	Result
No changes	Black castles 50% more often than White
All games start with 1. e4 so black goes first	Black castles 50% more than White
Black moves first with custom FEN [*]	Black still castles 50% more often
Disable Castling Gene	Black castles twice as often, but castling is performed 1/3 as often in total

From the last result, at least I know the Castling Possible Gene is doing something.

[*] rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR b KQkq - 0 1

[MarkZH]

Create a cumulative count of castling for black and white like the one for game openings.