Charles This terminology in English goes back a number of decades. Any Japanese or other term?
(Later): I see that the term, focal point, does not appear in the 2001 edition of the Go Players Almanac. Where does it appear in the go literature?
(Much later) I just ran across the term, 模様の接点, at this site, which may be temporary. 接点 is typically translated as contact point. The place where two moyos come into contact does make sense to me.
Also, a web search did uncover Japanese references to 模様の焦点 . I guess you can think of the place where moyo come together.
unkx80: I suspect tennozan is 天王山. =)
Bill: Yes. Thanks for the characters. :-)
unkx80: Then it is written exactly the same way in Chinese. =P
RobertoCorsini: I believe the term Focal Point refers to the simple fact that the move brings focus of the whole game into that area. It may not be a direct sente, but if left unanswered it will most likely prove to be a disaster. Thus, the one who makes a focal point move forces the opponent to do so as well - or find an even bigger move - possibly changing the course of the game.
Bill: Tennouzan is the more general term in Japanese (maybe in Chinese, too). What is somewhat misleadingly called focal point here -- and maybe elsewhere, but I asked for references and got none -- is one kind of tennouzan.
unkx80: Frankly speaking, my idea of what is exactly a "focal point" and what exactly is "tennouzan" is a bit fuzzy. Searching for "focus point" on Google does not seem to give a lot of hits. Nonetheless, here are some references I found:
I originally equated "focus point" with "tennouzan" on the basis of what was written on the parent page, but it does not seem to be true anymore. As such, I conjecture that:
In this respect, I propose to replace the Chinese term of "focus point" with 焦点, which is actually a direct translation of "focus point" in normal usage.
My understanding may be wrong though. Please correct me if it is so. =)
Bill: Thank you so much for the references, unkx80! :-)
As for focal point and tennouzan, I guess they are just terms that overlap sometimes.
unkx80: I guess, they overlap to quite a great extent, that they may be used interchangably for most of the time, I suppose?
Bob McGuigan; Somewhere I saw the sort of move under discussion here described as being at the "junction of two moyos". I'm not too happy with focal point myself. It has a use in general discourse that does not agree with the go use. And you could refer to the focal point of a position and not mean a place where two moyos intersect. Moreover I'm not sure there is aneed for a specific term for this. If the importance of a play at such a point needs explaining, say in a commentary, I think it would be better to use a self-explanatory phrase such as "Black should have played at A which is a strategic point for both players' moyos".