  A block-correlated coupled cluster (BCCC) method based on the generalized
valence bond (GVB) wave function (GVB-BCCC in short) is proposed and
implemented at the ab initio level, which represents an attractive
multireference electronic structure method for strongly correlated systems. The
GVB-BCCC method is demonstrated to provide accurate descriptions for multiple
bond breaking in small molecules, although the GVB reference function is
qualitatively wrong for the studied processes. For a challenging prototype of
strongly correlated systems, tridecane with all 12 single C-C bonds at various
distances, our calculations have shown that the GVB-BCCC2b method can provide
highly comparable results as the density matrix renormalization group method
for potential energy surfaces along simultaneous dissociation of all C-C bonds.
