Different Sized Boards
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.
(up to) 2x2: Results of games up to 2x2 http://web.archive.org/web/20080509132201/http://www.brooklyngoclub.org/jc/go2by2.html
- Commonly used to introduce the game using capture go.
- smallest square board where white can create a 'normal' living group if black plays optimal.
- The smallest undecided board with an odd number of lines (Proofs?! --RobertJasiek).
- Popular for fast and instructive games.
- Uncommon board size.
- Also popular.
- Popular in China many years ago. 15x15 was also promoted briefly by the Nihon Kiin for the purpose of promoting the game amongst junior players. 15x15 is also the official board size for Renju (competitive version of Gomoku).
- Currently used in Tibetan go. In ancient China it was the mainstream size before Jin Dynasty (265 AD - 420 AD), and was thoroughly replaced by the 19x19 board during Tang Dynasty (618 AD - 907AD) source.
- The default size in the current era. The earliest 19x19 board appeared during Han Dynasty (206 BCE - 220 AD), and became mainstream size during Southern & Northern Dynasties (420 AD - 589 AD) source. Why19x19
Aside from actual play, smaller boards are often used in books for presenting problems or instruction purposes. Examples:
- Book of 105 problems on 4x4 board (Japanese), by Cho U (ISBN-13: 978-4344979765, Kindle editon ASIN: B07CKY1VK5)
- How to Improve on a 5x5 Board by Fukui Masaaki, which was recently translated to English
- An introductory book by Nihon Kiin using 7x7 board (Japanese, ISBN-13: 978-4344977853)
- As ealy as 1918, an introductory book by Suzuki Tamejiro used 11x11 board diagrams including a hypothetical full game record. He called it as his "own innovation".
- Even-sized boards
- Why not?
- Small boards
- 17x17 and smaller.
- Large boards
- 21x21 and beyond.
- Rectangular boards
- 19x13 and others.
- Narrow Boards
- 2xN and others.
- Linear boards
- 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.
- Possible rule set for non-standard boards
- 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.
This part contains about a board that has no edge. If a board has no edge, both player's playing would increase forever. So even if both players construct their territories, stopping the game at random timing is illegal. But if they play forever, the game can't be finished. And if the ruleset is that "territories creating faster wins", White tries to block black's territories creating. So the ruleset is able to be only in "Handicap games" or "games that start from both stone's arrangement". But people would disbelieve "What is the point of playing on a edgeless board with changed rules".
This part contains about boards that increase unto the next right intersections when white plays once.