  We discuss the application of the chiral N3LO forces to three-nucleon
reactions and point to the challenges which will have to be addressed. Present
approaches to solve three-nucleon Faddeev equations are based on a partial-wave
decomposition. A rapid increase of the number of terms contributing to the
chiral three-nucleon force when increasing the order of the chiral expansion
from N2LO to N3LO forced us to develop a fast and effective method of
automatized partial wave decomposition. At low energies of the incoming nucleon
below about 20MeV, where only a limited number of partial waves is required,
this method allowed us to perform calculations of reactions in the
three-nucleon continuum using N3LO two- and three-nucleon forces. It turns out
that inclusion of consistent chiral interactions, with relativistic 1/m
corrections and short-range 2pi-contact term omitted in the N3LO three-nucleon
force, does not explain the long standing low energy Ay-puzzle. We discuss
problems arising when chiral forces are applied at higher energies, where large
three-nucleon force effects are expected. It seems plausible that at higher
energies, due to a rapid increase of a number of partial waves required to
reach convergent results, a three-dimensional formulation of the Faddeev
equations which avoids partial-wave decomposition is desirable.
