  A search for electroweak production of supersymmetric particles is performed
in two-lepton and three-lepton final states using recursive jigsaw
reconstruction. The search uses data collected in 2015 and 2016 by the ATLAS
experiment in $\sqrt{s}$ = 13 TeV proton--proton collisions at the CERN Large
Hadron Collider corresponding to an integrated luminosity of 36.1 fb$^{-1}$.
Chargino-neutralino pair production, with decays via W/Z bosons, is studied in
final states involving leptons and jets and missing transverse momentum for
scenarios with large and intermediate mass-splittings between the parent
particle and lightest supersymmetric particle, as well as for the scenario
where this mass splitting is close to the mass of the Z boson. The latter case
is challenging since the vector bosons are produced with kinematic properties
that are similar to those in Standard Model processes. Results are found to be
compatible with the Standard Model expectations in the signal regions targeting
large and intermediate mass-splittings, and chargino-neutralino masses up to
600 GeV are excluded at 95% confidence level for a massless lightest
supersymmetric particle. Excesses of data above the expected background are
found in the signal regions targeting low mass-splittings, and the largest
local excess amounts to 3.0 standard deviations.
