For the generation of new candidates, the GOFEE method uses three different approaches. For the initial population it generates the candidates by placing the atoms randomly inside a box, checking that the atoms are not too close or too far from each other. For subsequent additions of candidates, two additional strategies are used as well, Permutation and Rattling, both transforming pre-existing structures. Permutation exchanges the positions of two atoms of different element selected at random and Rattling displaces one or more atoms in a structure by a random distance. The decision of which strategy is used to create a new candidate is stochastic. The probabilities of selecting each method are provided as a parameter and in the present work have been established as 0.6, 0.2, and 0.2 for random placement in a box, permutation and rattle Mutation generators, respectively. For the fully reduced systems, which do not globally optimize the positions of any O atom, Pt and O cannot be permuted and we chose 0.8 and 0.2 probabilities of random placement in a box and rattle mutation, respectively.