Electronic degeneracies and multi-configurational character of the low-lying states of the Cvetanović diradicals make electronic structure calculations rather involved. Figure shows all electronic configurations that can be generated by distributing 4 electrons in 3 orbitals. There are five A determinants that can give rise to closed-and open-shell 1 A configurations. Of these, determinants (4) and (5) give rise to 3 A state. Determinants (6)- (9) give rise to open-shell 1 A and 3 A states. In contrast to many previous studies, which have employed multi-reference methods based on complete-active-space self-consistent field (CASSCF) augmented by various treatments of dynamic correlation, here we explore an alternative approach, equation-of-motion coupled-cluster methods with single and double excitations (EOM-CCSD). By combining deliberately chosen references with various types of EOM operators, EOM-CC can describe a wide range of multi-configurational wavefunctions within a single-reference formalism. Particularly attractive features of the EOM-CC methods are (i) simultaneous account of dynamic and non-dynamic correlation; (ii) their black-box nature (no active space selection or state averaging is involved); and (iii) their ability to describe multiple interacting states in the same calculation. The latter feature simplifies the calculation of interstate properties, such as spinorbit and non-adiabatic couplings, and the analysis of transition properties. However, despite its flexibility, some electronic degeneracy patterns are beyond the reach of currently available EOM-CC variants. The bottom panel of Fig. shows electronic configurations, which are used as references in different EOM calculations. As one can see, only the DIP configurational space includes all 9 determinants on equal footing, thus providing the most balanced description of the electronic states. In contrast, in EE calculations, determinant (1) represents the reference and determinants ( )-( ) are single excitations and the rest are double excitations. The analysis of the singlet CCSD wavefunction reveals that closed-shell reference is ill-behaved near the lowest triplet minimum, i.e., the norms of the cluster amplitudes exceed unity. Consequently, EOM-EE-CCSD leads to an unbalanced treatment of configurations and an incorrect state ordering. Moreover, the results of (T) calculations are quite wrong; however, (dT) and f(T) corrections do give consistent and reasonable results (see SI, Section 2). In EOM-SF, the set of target determinants depends on which triplet reference is used.