MS-Xα calculations have been carried out for B6H-26, B5H9, and 1,6-B4C2H6. Even with the simple muffin-tin approximation, the agreement of the transition state orbital energies with the measured photoelectron spectral ionization potentials for B5H9, and 1,6-B4C2H6 is as good or better than that found with previous ab initio minimum STO basis LCAO-MO-SCF calculations. The undesirable brittleness of the refractory borides is due to boron polyhedra being joined together in three-dimensional networks by unpaired outpointing electrons at the apices of the polyhedra. It is suggested that a way to ameliorate this brittleness would be to replace some of the boron atoms by carbons (or nitrogens or oxygens) to cut down on the outpointing unpaired electrons and thus to cut down on three dimensional network bonding. It is further hypothesized that such “carborides” or related congeneric species might also have an excellent possibility of being high-temperature superconductors.