On a chessboard, positions are marked with a letter between a and h for the column,
and a number between 1 and 8 for the row. Given two position strings (e.g. "a1", "b8"),
return true if they have the two spaces are the same color. The first place on the board,
a1, is black. The next is white, alternating across a row. Odd rows start with black,
even rows start with white.