  We present a set of evolutionary computations for binaries with a B-type
primary at birth. Some liberal computations including loss of mass and angular
momentum during binary evolution are added to an extensive grid of conservative
calculations. Our computations are compared statistically to the observed
distributions of orbital periods and mass ratios of Algols. Conservative Roche
Lobe Over Flow (RLOF) reproduces the observed distribution of orbital periods
decently but fails to explain the observed mass ratios in the range 0.4-1. In
order to obtain a better fit the binaries have to lose a significant amount of
matter, without transferring too much angular momentum.
