A struct describing a Hex board of a given size. For information about hex grids in computers,
look at the excellent Red Blob Games guide on the
subject.
A coordinate system suitable for Hex games. The standard setup is a parallelogram, with letters
a-z representing columns from left to right, and numbers 1-26 representing rows from top to
bottom. In the most common orientation, the top left corner is farther left than the bottom left
corner, and so the longest diagonal runs from the top left to bottom right.