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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.
See also Interesting board sizes and Small Board Go.
"Ferdi" is, I believe, Andreas Fecke, a member of the Dragon Go Server. He has five accounts--one for only 5x5 go, one only for 7x7 go, one for 13x13, one for handicap games, and another for, apparently, only 19x19 traditional go. His rank is about 2d or 3d, so the difficulty of the problems is not suprising.
unkx80: Ferdi is Andreas Fecke. =)
Quicksilvre Yes! I am good. On the other hand, I guess I should have used the search function in the first place.