takodori: That's such specialised knowledge that it makes no sense for BrainKing to provide it. Among the difficultes would be what "preferred" means. How is it judged? It's likely that it's something with a fuzzy definition and probably you'd want to play with it until it gave what you considered the most meaningful results. I imagine that the best solution, though practically impossible, is that of writing a program to do external analysis of the games.