• galaxies: clusters: general;   • cosmology: observations;   •
X-rays: galaxies: clusters   We present the results of a simple
but robust morphological classification of a statistically
complete sample of 108 of the most X-ray-luminous clusters at
0.15 ≤z≤ 0.7 observed with Chandra. Our aims are to (a) identify
the most disturbed massive clusters to be used as gravitational
lenses for studies of the distant Universe and as probes of
particle acceleration mechanisms resulting in non-thermal radio
emission; (b) find cluster mergers featuring subcluster
trajectories that make them suitable for quantitative analyses
of cluster collisions; and (c) constrain the evolution with
redshift of the cluster merger fraction. Finally, (d) this paper
represents the third public release of clusters from the MAssive
Cluster Survey sample, adding 24 clusters to the 46 published
previously. To classify clusters by the degree of relaxation, we
use the projected offset of the brightest cluster galaxy from
the peak (or the global