John Fairbairn wrote:
this is obvious to a Japanese from the term de-iri, since he understands the meaning of de-iri in the normal language
Is "deiri" contained in the Japanese word describing a boundary and does it contain a meaning of "optimise"? To non-Japanese speakers, any such meaning is hidden and has not found its way into translations of English books, AFAIK.
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So it has appeared in the literature from at least the 1950s.
Quite likely. I meant "hidden" to Western players without knowledge of Asian languages or access to those books. I have never seen any Asian book about the opening or middle game whose diagrams might have conveyed such contents.
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Also you admit Saijo told you about it,
He did NOT tell me a) the general nature, b) hint at the general applicability to boundaries, c) the aim to maximise / minimise. He only commented on the particular example shape.
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so for two reasons it clearly wasn't hidden knowledge.
I meant "hidden" to Western players without knowledge of Asian languages. Neither of your reasons removes this.
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which also means 'lean against'
My principle has a more specialised meaning.
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and yet again if 6-dan amateurs know it, it is hardly hidden.
1) There is no evidence that, prior to my publication, any Western 6d+ would have been able to express the contents of the principle.
2) For Western players trying to become 6d, the contents of my principle was hidden because Western 6d+ did not tell them and asking them would not work because of still being unaware of what to ask for. Likewise, simply watching games of Western 6d+ or any professionals does not likely reveal the contents. It required input from Asian sources (such as a Western player would get as an insei in Asia) or diligent study on one's own with gaining the, probably only subconscious or implicit understanding. The contents of the principle is such that somebody improving from 5d to 6d somehow likely gets a context of understanding, in which the contents of the principle is a side-effect of a developed broader understanding of a) reductions and their relation to the (possibly remote) positional environment and b) new versus old value of a given moyo and its stones.
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It may be buried but there's lots of it.
Surely there is a lot, but most is verbal. I have discovered many principles that I have never seen taught anywhere explicitly in writing but that one can occasionally hear in amateur or club players talk.