  We investigate the QCD phase diagram for small values of baryon and strange
quark chemical potentials from simulations at non-zero isospin chemical
potential. Simulations at pure isospin chemical potential are not hindered by
the sign problem and pion condensation can be observed for sufficiently large
isospin chemical potentials. We study how the related phase boundary evolves
with baryonic and strange chemical potentials via reweighting in quark chemical
potentials and discuss our results. Furthermore, we propose and implement an
alternative method to approach nonzero baryon (and strange quark) chemical
potentials. This method involves simulations where physical quarks are paired
with auxiliary quarks in unphysical "isospin" doublets and a decoupling of the
auxiliary quarks by mass reweighting.
