Another quick thought--I think I'm the last person in the English-speaking world who hasn't read them, but isn't there some sort of chess (wizard's chess or something??) in one (or more?) of the Harry Potter books?
I'm drawing a bit of a blank about other kids' books--there are some wonderful adult things (I've mentioned the wonderful "The Flanders Panel" by Arturo Perez Reverte in another thread...and of course there's Nabokov--"The Defense," I think?--haven't read that one, but I suspect pretty heavy going--and for a movie, apart from "Searching for Bobby Fischer," there's Bergman's "The Seventh Seal," none of which are too much use for a five year old!!!)
Sorry not to be more use....
mm