Discussion:
rationale on "official" go board sizes
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marc
2018-06-07 07:54:13 UTC
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The "official" go board sizes are 19, 9 and 13, in decreasing popularity order, being 19 the only one used in serious tournaments. Other sizes that have been used are 17, 11 and 25.

When googling with text "go board sizes why" you may get the following links, depending on your country and google profile. I have sorted by decreasing order of interest.

- Francis Road's take at https://www.britgo.org/bgj/01310 (1971!)
- a debate on a php forum (2014) https://lifein19x19.com/forum/viewtopic.php?f=10&t=10814 that contains some interesting answers, but also noise
- a Quora entry that does not say much https://www.quora.com/Of-all-the-possible-sizes-why-is-19x19-the-standard-board-size-in-the-game-of-Go
- a senseis library entry, but information but no conclusive info https://senseis.xmp.net/?DifferentSizedBoards

Still, it seems that the go board sizes have no rationale whatsoever, but however if you are a somehow seasoned player it does not feel that these numbers have been randomly chosen. But what is the relationship between these numbers (9, 13, 19)?
Robert Jasiek
2018-06-08 11:32:32 UTC
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Post by marc
what is the relationship between these numbers (9, 13, 19)?
The are odd so have a tengen. 19 is popular because of its balance
between territory and influence, and balance of complexity of just
being complex enough to offer at least centuries of exitement as a
possible lifetime occupation for many players. 9 is the smallest odd
board of interest for regular players (who do not care whether smaller
boards are interesting for researchers). 13 is the best compromise odd
size between 9 and 19, and allegedly is the smallest odd size to offer
en miniature all strategic concepts of 19.
Bernhard Kraft
2018-06-08 11:48:18 UTC
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Post by marc
Still, it seems that the go board sizes have no rationale whatsoever, but however if you are a somehow seasoned player it does not feel that these numbers have been randomly chosen. But what is the relationship between these numbers (9, 13, 19)?
19 is tradition. 13 is half the territory. 9 ist half it again.

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