  The Density Matrix Renormalization Group (DMRG) algorithm has been a rising
star for the accurate ab initio exploration of Born-Oppenheimer potential
energy surfaces in theoretical chemistry. However, owing to its iterative
numerical nature, pit falls, that can affect the accuracy of DMRG energies,
need to be circumvented. Here, after a brief introduction into this quantum
chemical method, we discuss criteria that determine the accuracy of DMRG
calculations.
