Different Sized Boards
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The game of go is usually played on a board with two orthogonal sets of 19 lines. Such a board is said to have a size of 19x19. It is certainly possible to play Go on a board of any desired size, so long as one can find a way to represent the board and has enough stones to fill it. Most computer go programs allow one to choose the board size. Some programs allow boards which are rectangular, such as a 13x19 board, while others require the board to be square. One can also take a typical 19x19 goban from the real world and shrink it to a smaller size using various techniques to mask out the nonessential lines.
This section is dedicated to exploring the implications on play of different sized boards that have existed historically, traditionally and experimentally, as well as any related culture.
Different sizes
(up to) 2x2: Results of games up to 2x2 http://brooklyngoclub.org/jc/go2by2.html
- 5x5
- Commonly used to introduce the game using capture go.
- 6x6
- smallest square board where white can create a 'normal' living group if black plays optimal.
- 7x7
- The smallest undecided board with an odd number of lines (Proofs?! --RobertJasiek).
- 9x9
- Popular for fast and instructive games.
- 13x13
- Also popular.
- 15x15
- Popular in China 1000 years ago. And still used. I bought a set in 2003 with plastic stones and 15x15 paper board. Chinese play gomoku on these; I've never seen one used for go.
- 17x17
- Used in Tibetan go, and in China 500 years ago.
- 19x19
- The default size in the current era. Why19x19
See also Interesting board sizes and Small Board Go.
Unusual properties
- Even-sized boards
- Why not?
- Small boards
- 17x17 and smaller.
- Large boards
- 21x21 and beyond.
- Rectangular boards
- 19x13 and others.
- Linear boards
- 1xN
Miscellaneous
- Unusual gobans
- Boards with holes, strange shapes and other weirdness.
- How to shrink a goban
- Techniques to turn a standard board into a smaller one.
- NetGo
- Possible rule set for non-standard boards
Elsewhere
- At
goproblems.com, Andreas Fecke, by the username of ferdi has created a series of
4x4 problems. The problems are generally difficult, precision is needed to solve them.