play of games and now we need to approximate it put heuristics in prune the tree blah blah blah and so on so we can do that also with a hike symbol but for generally I it can also inspire those and most of most researchers go bottom-up right they have the systems that try to make it more general more intelligent it can inspire in which direction to go what do you mean by that so if you have some choice to make right so how should they evaluate my system if I can't do cross validation how should I do my learning if my standard