The method is tested on 100 elementary reactions used previously by Zimmerman and co-workers (Table ). For each of the 100 reactions, the procedure is run three times with two different but similar parameter strategies for the xTB path calculations (Table ) for a total of 6 runs. Combining all TSs located during the six runs, a total of 89 TSs are found. Only two of the remaining 11 reactions (reactions 16 and 84) went to minima corresponding to the proposed reactant and product structures, while the majority of the 9 reactions found an intermediate minimum structure along the way, indicating that the reaction (at least within this level of theory) is not an elementary reaction. Thus our method failed for only two reactions (Figure ), where the product is not a stable structure on the xTB potential energy surface. Furthermore, we show that the RMSD-PP barrier is a good approximation for the corresponding DFT barrier for reactions with DFT barrier heights up to about 30 kcal/mol. Thus, RMSD-PP barrier heights, which can be computed at the cost of a single energy minimisation, can be used to quickly identify reactions with low barriers, although it will also produce some false positives.