  Considering Ginsparg-Wilson type fermions dynamically in lattice QCD
simulations is a challenging task. The hope is to be able to approach smaller
pion masses and to eventually reach physical situations. The price to pay is
substantially higher computational costs. Here we discuss first results of a
dynamical implementation of the so-called Chirally Improved Fermions, a Dirac
operator that obeys the Ginsparg-Wilson condition approximately. The simulation
is for two species of mass-degenerate quarks on 12^3x24 lattices with spatial
size up to 1.55 fm. Implementation of the Hybrid Monte-Carlo algorithm and an
analysis of the results are presented.
