Side patterns (version 82)
A pilot classification of side patterns (19x10).
|Table of contents|
In alphabetical order we have hoshi, komoku. mokuhazushi, sansan, takamoku as names in Japanese for the 4-4, 3-4/4-3, 3-5/5-3, 3-3 and 4-5/5-4 points respectively. It happens that this is also a sensible priority order in which to look at formations, based on frequency in contemporary go.
Therefore a lexicographic order HH, HK, HM, HS, HT, KK ... and so on is reasonable for look-up. To distinguish colours in formations of two stones, we write for example H/H for alternating play and H+H for nirensei (two 4-4 points of the same colour).
H+pK and H+oK are respectively parallel and orthogonal versions of a 4-4 and 3-4/4-3 point on a side (there are two relative positions that need to be distinguished).
Other pages about side units and patterns
Some other pages about sides include Kobayashi variants, mini-chinese variants?, variant 135s, further 135 variants, ryojimari sides, jabberwocks, preferring to pincer.
The wedge variants path includes a number of examples drawn from standard side patterns such as nirensei.
The co-ordination between adjacent corners page is trying to get a grip on some more advanced issues.
A little research on side patterns shows the importance in practice of outliers: stones at the 3-10, 4-10, 3-9 and 4-9 points. (Outlier means a minor part of a geological formation.) These affect greatly the choice of play on the side in pro games. It is wrong, therefore, to disregard their possible effect on side patterns (even if it may mean 17 times more work). See side patterns - outliers for an introduction.
H+H Two Stars
Also known as nirensei, parallel 4-4, parallel hoshi.
- Nirensei Fuseki
- Nirensei v Nirensei
- An interesting point about direction when White approaches next at c
- Develops to sanrensei when Black adds at a
- Sanrensei simplest comments
- Sanrensei low variant when Black adds at b
The following pages investigate how this side is played with some extra stone at one of the marked points
- Develops into the Orthodox fuseki if Black adds a
- Can develop into the Kobayashi Mark I after White plays at a.
- Side pattern from VER 2003
- Side pattern - Shusaku diagonal in H versus oK
- Side pattern - Rin Kaiho's Onadare and 4-4 high approach
This is possibly the most complex and rich side pattern - appearances to the contrary - judging by the number of mainstream continuations (about 20).
- Develops into the Chinese after Black adds a (low chinese) or b (high or revised Chinese).
- Develops into the Mark II Kobayashi formation when Black adds c.
- See intermediate plays for a pattern after White approaches at d.
- Can develop into the mini-chinese after White plays a
- Pincer counter to mini-chinese
- Can develop into pushing battle and counter-pincer joseki family after Black plays at b.
- Running fight example 1.
- Rotating komoku.
- Develops into an enclosure opening when Black adds a, b, c or d.
- Develops into a Chinese-style enclosure opening when Black adds e or f.
These side patterns matter after the strategy of preventing the formation of the Chinese opening.
John F. For my money, Charles's work on side patterns, which was also one of the highlights of the old MSO site, is one of the most important contributions to go teaching by a westerner. And I can go back a long way. Can I suggest one tiny improvement? , and ; are not always very clearly distinguished either on screen or in print, and it is not obvious which is which. Using a hyphen for ; would aid visual clarity, and by analogy with the already accepted 4-4 usage would tell us instantly it means same-colour stones (or = instead of - may be even more obvious). For , I'd suggest something more substantial: ^ or *. Or ! with the well-known "not" meaning implying opposite colours??????
One other thing I'd like to suggest is naming various parts of the side. I've a feeling that five parts can be distinguished. If we think of the corners as cities and the area below the centre hoshi as the countryside, the bits in-between are the suburbs. These areas seem to come up often enough in modern discussions of theory to be worth naming. I haven't seen a settled Japanese name, so it's up for grabs.
Charles I can certainly change the notation - it's an example of the sort of thing that I'd use in private notes. How about + for stones of the same colour, for starters: H+S is hoshi plus sansan. And maybe H/S for different colours, hoshi versus sansan?
As for sensitive side areas, I know whence John is coming on this one. Still a bit premature, methinks.
I mean, there is something at http://gobase.org/studying/articles/matthews/fuseki/14/ and something here at preferring to pincer; and the Go Seigen ideas John was talking about in December at the BGA Training Day. But before I rush into some synthesis, I think I'd like to get more research together.
John F. Just mulling over the notation a bit more before Harry Potter takes over the weekend, +/ seems a big improvement on ,; and I wondered whether there was any value in using // for parallel and one of ^ v < > for aspects of orthogonality?
togo: There remains one problem: One letter 'o' respectively 'p' is not sufficient for orientation. Both corners have two possible orientations regarding the side (except for H and S), giving four possible orientations for two non-symmetric corners. So each non-symmetric corner should have their own letter 'o' respectively 'p'.
Also it would be a good idea to properly define 'orientation'. That might be the main direction of influence. Or the main direction of influence after adding one stone of the same color.
 Bill: To avoid confusion with typical go usage of the term, side, which contrasts with corner and center, how about a title like, Half board patterns? or Opposite corner patterns?? The material on this page was a big surprise for me when I navigated here. Either of these titles would have been clear. The current one is ambiguous.
Charles Bill, do I have to change the name of my web series to 'On Your Half-Board' to fit in with your conception? I don't see that opposite corner is clear - that says tasuki fuseki to me. I could make an alias for this page as whole side patterns? if it makes you happier.
Bill: No, Charles, of course not. In fact, I think that your removes the ambiguity. :-) I am pointing out my confusion about the title of this page and its ambiguity.
Hmmm. Thinking about it, I suppose that someone who created a page about side patterns in the other sense could call the page something like Patterns on the Side.
As for tasuki fuseki, I think the term is diagonally opposite corner.
Later thought: One side patterns?. I think that that removes the ambiguity by the implicit contrast with the other side.