Orbital period vs. mass ratio relation for six cases of initial orbital periods (1.25, 3, 5, 10, 50, and 70 days) and masses M_don, ini = 30 M_⊙ and M_acc, ini = 20 M_⊙. Different tidal synchronization prescription regimes i.e. sync_type = “Hut_rad” (MESA default) and sync_type = “structure_dependent” (POSYDON) are presented. In addition, different fractions of mass lost from circumbinary toroid (via changing the mass transfer efficiency parameters δ and γ, see text for details) are shown. The cases with γ = 0 refer to the conservative mass transfer scenario. The RLOF phases are marked by a bold line. Filled and open circles indicate the reasons of track termination: both stars filled their Roche lobes or numerical convergence problem, respectively. In the case of 1.25 day configuration, both stars filled their RL almost simultaneously and we consider that all tracks indicate a subsequent merging.