Represents a single tile on a chess board:
A letter from a to h is used to address
a column, called a file, on the board. To address a row
which is called rank,
a number from 1 to 8 is used.
(e.g. tile e4 is mapped to Vector(4, 3))
A notation that allows one to represent the state of
a chess board using alphanumeric characters.
Pieces are represented by their letter symbols (E.G Q=Queen, N=Knight).
Capital letters are for white chessman, lowercase letters for black ones.
Empy squares are represented by numbers (E.G. 3=three empty space).
The position is recorded rank by rank starting with the eight rank (a8)
the ranks are separeted by a '/'