  The paper by Taroni et al. (2016) considers results of forward prediction of
Italian strong earthquakes by CN algorithm with the declared intent of
providing "a careful assessment of CN prediction performances... using standard
testing procedures". Given the very limited number of target events within each
region, however, the considered situation is non statistical, and a priori it
is clear that the standard statistical methods are not effective here. The
attempt to replace the standard approaches by Pari-mutuel Gambling Score (PGS)
method leads to almost complete loss of information about predicted
earthquakes, even for a large sample of target events. Therefore, the
conclusions based on PGS, are untenable.
