Bob McGuigan: I am not sure the definition of tennozan on the main page is inclusive enough. I have been reading the book Igo no Miryoku (囲碁の魅力) ("The Charm of Go") by Nakayama Noriyuki. There is an example there of a move which doesn't seem to fit the definition on the main page. Judging by this example moves which we might call tesuji can sometimes also be called tennozan. Here is the example:
Starting with the position
He is apparently using the term tennozan in an extremely broad way to mean simply a move which either player would like to take. I've never heard or seen the term tennozan applied to this sort of move and I'd have to conclude he's taking undue liberties with the word here.
Bob McGuigan: Mr. Nakayama might be using a little poetic license, but since is a key point for the whole area in this example, perhaps the use of tennozan is not so far off.