BH formation by fallback in SN explosions of single and binary-stripped stars at Z = Z_⊙, as predicted by the deterministic criterion E_delay − E_expl > 0. The dots show the E_expl and E_delay predictions with M16, which is used to explode the SN progenitor models from the S21 sample, as a function of progenitor M_CO. These are fitted using GPR regressors for each of the SN progenitor types as classified by MT history (single, Case A, Case Be, Case Bl, Case C). Non-exploding single and binary-stripped star models were removed from the S21 sample. The direct BH formation boundaries predicted by our CCSN recipe are indicated by vertical dashed lines. Due to the sparse sampling of the S21 stellar models, the prediction intervals (shaded regions) are wide and overlap, not allowing for a faithful prediction of the remnant type using our deterministic fallback BH formation criterion.