  We demonstrate the important role of anisotropic neutrino radiation on the
mechanism of core-collapse supernova explosions. Through a new parameter study
with a fixed radiation field of neutrinos, we show that prolate explosions
caused by globally anisotropic neutrino radiation is the most effective
mechanism of increasing the explosion energy when the total neutrino luminosity
is given. This is suggestive of the fact that the expanding materials of SN
1987A has a prolate geometry.
