https://senseis.xmp.net/?Joseki
Overview
Joseki are generally-agreed-upon sequences of play which can result in a fair outcome for both players. Usually there isn't a joseki in a given situation, but different joseki for different purposes, between which a choice has to be made.
The Chinese term for joseki means "settled pattern." The Japanese
term, which uses the same initial character, literally means "settled
stones." The Korean term uses the same Chinese characters meaning, in
Korean usage, "right" / "proper" + "stone." What sequences are
considered joseki has changed throughout history, due to modern
research, innovation and changing professional perspectives.
If a sequence is not considered to be joseki, that may mean that the
one side made a clear-cut mistake; that professional opinion considers
the trade-offs inherent in the sequence (between sente and gote, between
territory and influence, between speed and solidity) to favor one side;
or that the situations where the sequence is needed are so rare that no
one is familiar with the intricacies of the different branches of the
sequence.
In general, "joseki" refers to sequences in the corner, and even more narrowly to the sequences that follow from approach moves in the opening. But while this is the most common use of the term, there are also joseki associated with straightforward reductions and invasions of the corner that occur later in the game, and common plays along the sides may also be considered "side joseki" or "middle-game joseki".
- a: komoku 3-4 joseki
- b: hoshi 4-4 joseki
- c: sansan 3-3 joseki
- d: mokuhazushi 3-5 joseki
- e: takamoku 4-5 joseki
- f: omokuhazushi 6-3 joseki
- g: otakamoku 6-4 joseki
- h: gonogo 5-5 joseki
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