  In seeking a model solving the coincidence problem, the effective Yang-Mills
condensate (YMC) is an alternative candidate for dark energy. A study is made
for the model up to the 2-loop order of quantum corrections. It is found that,
like in the 1-loop model, for generic initial conditions during the radiation
era, there is always a desired tracking solution, yielding the current status
$\Omega_\Lambda \simeq 0.73$ and $\Omega_m \simeq 0.27$. As the time $t\to
\infty$ the dynamics is a stable attractor. Thus the model naturally solves the
coincidence problem of dark energy. Moreover, if YMC decays into matter, its
equation of state (EoS) crosses -1 and takes $w\sim -1.1$, as indicated by the
recent observations.
