  Very precise measurements of masses and cross sections are expected to be
achievable with a future linear collider. With such an accuracy one must
incorporate loop corrections in order to make meaningful predictions for the
underlying new physics parameters. For the electroweakino sector, this involves
fitting one-loop predictions to expected measurements of the cross section and
forward-backward asymmetry for chargino pair production and of the accessible
chargino and neutralino masses. We consider two scenarios with characteristic
features, chosen taking recent LHC SUSY and Higgs searches into account. Our
analysis allows the accurate determination of the desired parameters and,
additionally, access to stop sector parameters that enter via loop corrections.
