  Solar neutrino oscillations are supported by KamLAND's antineutrino
measurements, but certain solar neutrino data - the observed shape of the
${}^8$B flux and the difference between day and night counting rates measured
in Super-Kamiokande - do not fit well with the ensuing oscillation pattern.
Interestingly, other solar neutrino data allow independent tests of the
survival probability. Thanks to the new measurements of Borexino at
low-energies along with the standard solar model and to the results of SNO at
high-energies, four values of the neutrino survival probability are known. We
build and study a likelihood based only on these solar neutrino data. The
results agree well with the standard oscillation pattern and in particular with
KamLAND findings. A related and straightforward procedure permits to
reconstruct the survival probability of solar neutrinos and to assess its
uncertainties, for all solar neutrino energies.
