Allow Custom Settings for Group Ladders

[Jirogo36]

@shinuito suggested a board with even side-length before:

Measuring the Perfection Gap: a case for Integer Komi

I was thinking about this while looking at an example in Berlekamps book. If one really wants an even game with Chinese or area scoring rules with integer komi, shouldn’t we in theory also have an even number of points on the board, that is play with an NxN board with N even? In theory you could end up with a game with equal areas under japanese (territory) scoring but with one extra dame point filled in that swings the game on an odd size board in area scoring. (I know there’s more to consider…

I’m curious about 20 x 20.