N 2 dissociation is a challenging problem in quantum chemistry, and most single-reference methods will fail to describe this process, particularly at larger separations. This is due to the high amount of strong correlation required to dissociate the triple bond. To compare with existing sCI methods, we compared with the heat-bath selected configuration interaction (HCI) method in PySCF with varying levels of approximation. HCI depends on two parameters, 1 and 2 , and values for these parameters were chosen to reasonably mimic the level of accuracy obtained with the RLCI method at different levels of sparsity. This is to give a sense of how much each method can compress the wave function. Because the parameters that govern the accuracy of each method differ (the RLCI parameter is the number of determinants k, whereas the HCI values govern determinant cutoff parameters)