  Along with some other researches we have realised that the true origin of
high-temperature superconductivity should be found in the strong Coulomb
repulsion combined with a significant electronphonon interaction. Both
interactions are strong (on the order of 1 eV) compared with the low Fermi
energy of doped carries which makes the conventional BCS-Eliashberg theory
inapplicable in cuprates and related doped insulators. Based on our recent
analytical and numerical results I argue that high-temperature
superconductivity from repulsion is impossible for any strength of the Coulomb
interaction. Major steps of our alternative polaronic theory are outlined
starting from the generic Hamiltonian with the unscreened (bare) Coulomb and
electron-phonon interactions accounting for critical temperatures of
high-temperature superconductors without any adjustable parameters.
