  We calculate the properties of isospin-asymmetric nuclear matter based on
chiral nucleon-nucleon (NN) and three-nucleon (3N) interactions. To this end,
we develop an improved normal-ordering framework that allows to include general
3N interactions starting from a plane-wave partial-wave-decomposed form. We
present results for the energy per particle for general isospin asymmetries
based on a set of different Hamiltonians, study their saturation properties,
the incompressibility, symmetry energy, and also provide an analytic
parametrization for the energy per particle as a function of density and
isospin asymmetry.
