public boolean isKilled(int id) {
        Field field = getFieldById(id);
        String[] ships = field.getShips().split(",");
        String[] shots = field.getShots().split(",");

        List<String> list = new ArrayList<String>();

        for (int i = 0; i < ships.length; i++) {
            if (!ships[i].equals("")) {
                list.add(ships[i]);
            }
        }

        for (int i = 0; i < shots.length; i++) {
            list.remove(shots[i]);
            logger.info("list "+ list.toString());
        }
        if (list.size() == 0) {
            return true;
        } else {
            return false;
        }
    }