An update of the searches for charginos and neutralinos in DELPHI is
presented, based mainly on recent data collected at centre-of-mass
energies of 161 GeV and 172 GeV. No signal is found. For a sneutrino
with mass above 300 GeV/c(2) and a mass difference between the chargino
and the lightest neutralino above 10 GeV/c(2), the lower limit at 95%
confidence level on the chargino mass ranges from 84.3 GeV/c(2) to the
kinematical limit (86.0 GeV/c(2)), depending on the mixing parameters.
The limit, decreases for lower chargino-neutralino mass differences. The
limit in the case of a light sneutrino is 67.6 GeV/c(2), provided that
that there is no light sneutrino with a mass within 10 GeV/c(2) below
the chargino mass. Upper limits on neutralino pair production
cross-sections of about a picobarn are derived. The (mu, M-2) domain
excluded in the MSSM-GUT scenario is determined by combining the
neutralino and chargino searches. These results imply a limit. on the
mass of the lightest neutralino which, for a heavy sneutrino, is
constrained to be above 24.9 GeV/c(2) for tan beta greater than or equal
to 1. The search has also been extended to the case where the lightest
neutralino is unstable and decays into a photon and a gravitino
