public boolean checkSwarm() {
        List<Coordinate> needToCheck = new ArrayList<>();
        Set<Coordinate> checkedPieces = new HashSet<>();
        for (Piece piece : boardPieces) {
            needToCheck.add(piece.getCoordinate());
        }

        int numberofpieces = needToCheck.size();
        checkedNeigbours(checkedPieces, needToCheck, needToCheck.get(0));
        return numberofpieces == checkedPieces.size() || numberofpieces == 1;
    }

    private void checkedNeigbours(Set<Coordinate> checkedPieces, List<Coordinate> needToCheck, Coordinate coordinate) {
        for (Coordinate surrounding : coordinate.getNeighbours()) {
            if (needToCheck.remove(surrounding)) {
                checkedPieces.add(surrounding);
                checkedNeigbours(checkedPieces, needToCheck, surrounding);
            }
        }
    }