Equipment Dimensions

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First a general note: even the Nihon Ki-in rules do not specify exactly which sizes must be used (apparently, the phraseology is "is usually..."). From this, one can infer that the actual sizes are not of immense importance. The numbers here will not be agreed on by everyone either (see the discussion below).

Board

A 19x19 board should measure 454.5 mm by 424.2 mm. It should be 151.5 mm thick.

The lines are typically 1 mm thick. They should be spaced 22 mm apart left to right and 23.7 mm apart top to bottom.

Star point markers are typically 4 mm in diameter.

There should be 181 black stones and 180 white stones, which should be between 6 and 10 mm thick. White stones should have a diameter of 22.1 mm. Black stones should be a little bit larger. The stones are bi-convex; i.e., thicker in the middle than on the edges. (However, they shouldn't be "sharp").

Just for completeness: the following table recapitulates this information in other measurement units:

 Dimension                  SI       Imperial      Japanese
                           (mm)       (inch)
 Board width               424.2     16 23/32     1.4  shaku
 Board length              454.5     17 29/32     1.5  shaku
 Board thickness           151.5      5 31/32     0.5  shaku
 Line spacing width-wise    22           7/8      7.26 bu
 Line spacing length-wise   23.7        15/16     7.82 bu
 Line thickness              1           1/32     0.3  bu
 Star point marker diameter  4           5/32     1.2  bu
 Stone diameter             22.5        29/32     7.5  bu

(1 inch = 25.4 mm. 1 [ext] shaku = 100 bu = 303 mm.)

You can view a beautiful example of a board made using the above specifications.

Here are a couple of [ext] Google Groups articles that have different dimensions: [ext] Goban dimensions, a summary and [ext] Re: Go Board Dimensions.

A bit more detail on the "whys" of the above

A go board is not meant to be square. When seated in front of a square board, it would look wider than tall. Therefore, for reasons of perspective, they are longer in the direction from one player to the other than from left to right. [1]

Black stones are a little bit larger than the white ones to compensate for an optical illusion which would otherwise make the white ones look a little bit larger.

The stones should be a little bit larger than the left-to-right line spacing, which keeps them from being placed perfectly regularly on the board. This is for aesthetics; the far east culture traditionally does not like symmetry[2].

The stone thickness is a matter of taste. There are so-called "Chinese" type stones that are not symmetrical; they have an "up" side and a "down" side. (I've never seen these in real life.)

The board thickness given is for a floor board. The floor board typically has legs which are roughly 10 cm (4 inches) high, so that the playing surface is around 25 cm (10 inches) high. Playing on floor boards means that you sit on the floor, possibly with an armrest. Often, table boards are used (placed on top of a table). Table boards can be up to 5 cm (2 inches) thick.

Bowls

There are no sizes or requirements for the bowls. Suffice it to say that they need to be large enough to carry all the stones, and that a lid is useful, so that you can temporarily store the stones which you have captured.

BobMcGuigan: When floor boards with legs are used in Japan it is usual for the bowl to be placed on the floor in the middle of the side of the board facing the player, slightly underneath the board. This would mean that bowls shouldn't be too tall to fit underneath the board.


[1] - BenAxelrod: I wonder how true this statement is. From what i have seen in old wood block paintings, the board is usually longer from left to right.

StormCrow: That's because you're seeing the board from the side, not from the perspective of the players.


[2] Couldn't that dislike of symmetry be the cause of the not-square boards, too? SteffenGlueckselig

bkhl: I wouldn't think so. If that were the case it would hardly be made so that the rectangles look square from the players' perspective.

protognsis?: The length spacing would need to be more than 15/16ths in order for the board to look square from the player's perspective. Also, it varies ALOT based on the angle of depression from the person's eye level to the board.

Matthias: If my calculations are correct, this works for an angle of 68 degrees (where 90 degrees would be looking straight down from above the board). That may be a little higher than a normal playing position, but I guess the subjective perception is also influenceded by the brain that realizes it is not looking straight at the board. Also, if the length spacing would be increased, if would be hard to play with round stones, as the distance between two stones next to each other would vary too much.


Randall: I had trouble finding this page just now. (I'm about to buy some cheap equipment and I wanted to check what SL had to tell me about regulations sizes.) Had I not been so confident that it must exist, I would have given up before finding it. Equipment is the right word, but it wasn't the first thing that came to my mind. I searched for board, stones, regulation, and size. I don't know how hard it is to make the page easier to find -- perhaps people just need to be cleverer than or as persistent as I am.


mdh Can anyone post the measurements for a Chinese style board. I have been told that it is larger and the cells are square.

Pashley I'm in China. Boards here are typically square. Most boards, bowls and stones you see are pretty basic. Often there is a go board on one side, xiangqi (Chinese chess) on the other. Stones are flat on one side and sold in wicker basket bowls.

There are nicer boards around. I bought the commonest variety of these for about $100 US. They have the overall shape and decorated sides of a Chinese tea tray ([ext] http://funalliance.com/tea/htm/accessory/870102006.htm) in a fairly dark wood, with the lines and star points inlaid in mother-of-pearl.

Board is not to hand. I'll post measurements later.


Ender: Does anyone know of a walkthrough somewhere or have an idea of how to make your own stones from the slate and clam raw materials? I would imagine that it would be much less expensive than buyin them pre crafted...

Zarlan: I would imagine that it would, in fact, be much more expensive, unless you intend to make a very large amount of them.


mysticmonk? Have a set of Yunzi stones from China. They are slightly larger then the japanese standard. Does anyone know where you can find boards for these? It came with a Vinyl board that measures a little larger then my goban.

This site sells a board of the appropriate size:

[ext] http://www.go-gamestore.com/goequip/boards.htm Also, [ext] Yutopian might sell Chinese dimension boards.


Pashley Chinese stones have an advantage in some teaching games or friendly games where you want to have a discussion along the lines of "If B plays here, and W there, then ...". You can play a series of stones upside down -- flat surface up -- for discussion. When you're done, it is easy to remove the inverted stones and go back to the original position.


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This is a copy of the living page "Equipment Dimensions" at Sensei's Library.
(OC) 2005 the Authors, published under the OpenContent License V1.0.
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