getIndexFromSquare method
Implementation
(int, int) getIndexFromSquare(final String square) {
var row = 8 - square[1].codeUnitAt(0) + 48;
var col = square[0].codeUnitAt(0) - 97;
if (boardOrientation == PlayerColor.black) {
row = 7 - row;
col = 7 - col;
}
return (row, col);
}