[hpunjhqd] Go with a dynamically locally finer mesh

Augment the game of go 囲碁 with the ability to add more grid points to a part of a board; for example, divide a square into 4 quarters.

Not sure how this would work with game play.  General idea is, one or both players think a local battle is interesting and want to examine it in more detail.

Inspired by mesh refinement or grid refinement in partial differential equations.