public boolean equals(Object obj)
	{
		if (obj == this)
		{
			return true;
		}
		
		if (obj != null && obj instanceof Position)
		{
			Position other = (Position)obj;
			
			if (super.equals(obj) && other.z == z)
			{
				return true;
			}
		}
		
		return false;
	}