public CPiece this[string coordinate]
{
get { return(this[CSquare.Parse(coordinate)]); }
set { this[CSquare.Parse(coordinate)] = value; }
}
public CPiece this[CSquare square]
{
get { return(this[square.File, square.Rank]); }
set { this[square.File, square.Rank] = value; }
}
