Quasi-pincer

    Keywords: Joseki, Go term

It has been suggested that the content of this page should be merged with missing pincer.


Charles Matthews It seems that the pincer nomenclature could be usefully refined, with a new concept of quasi-pincer.

[Diagram]

Quasi-pincer?



At missing pincer it was argued that B1 here, while obstructing White's two-space extension along the side, should not count as a honest pincer because the sector line from black+circle to B1 leaves white+circle on the outside.

In the Bruce Wilcox theory of sector lines, cutting such a line to escape to the centre is given an important role. Here, therefore, there is a difference in the effect of B1, compare with the case when white+circle is at a. In the latter case, B1 is undeniably more severe, as evidenced by the ease of playing tenuki with White.

dnerra: Wouldn't this be a more appropriate definition of quasi-pincer? That the opponent can freely tenuki without suffering a local loss?
Charles Doesn't that assume a standard 'temperature' elsewhere, though? I wonder if this can be made to work.
dnerra I don't think so. With a quasi-pincer, the local temperature does not rise, with a usual pincer, it does. Does that make sense, or does it not?
Charles I suppose it does, giving a quasi-gote-pincer concept.

The consequences of introducing the idea of a quasi-pincer concept as suggested by this analysis would be the loss of pincer status also by these pincers:

[Diagram]

Not a real pincer?

[Diagram]

Not a real pincer?



And of course their 4-4 point analogues[1]. As well, the pincer at 3-4 point distant high approach from the wrong direction would be called a quasi-pincer.[2]


BobMcGuigan In Pincer Nomenclature Charles suggested that an essential feature of a pincer is to obstruct the pincered stone making a two space extension. In general the two space extension is most desirable for a stone on the third line because it helps make a base. With the "quasi-pincers" a two space extension is obstructed but the stone is on the fourth line so a base is not as relevant. The pincering stone on the third line does undercut the pincered stone but because it is on the fourth line it has easy access to the outside.


References on tenuki variations relevant here:


[1]

Those are quite rare moves; it is even rarer to see tenuki in reply, though.

[2]

If it were played without the Chinese-enclosure stone - but that is normally present, in practice.


This is a copy of the living page "Quasi-pincer" at Sensei's Library.
(OC) 2011 the Authors, published under the OpenContent License V1.0.
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