Does anyone know origin of smaller go boards (9*9,13*13)? When (and where) was first introduced? I looked on Sensei library but didn't find anything about history of go boards.
A Japanese pro 9-dan, Tomoyasu MIMURA (born 1969) writes in his blog entry (3 Feb 2014), ''I had never seen, or heard of 9x9 board in my childhood'' and ''In 1987 started the TV show 'Mini-Go One Game Match (ミニ碁一番勝負)'.... Professionals had begun to pay attention to the unexpected depth of 9x9 board game some time before''. Therefore, around 1985 would be a good guess.
Here is a reference from 1978: In Winfried Dörholt, Das japanische Brettspiel Go, both games on 13x13 and 9x9 are presented in a very natural way to introduce the rules and to have beginners games (no claim that it is a brand new invention). Therefore, at least in Germany, the small boards were well-known in the 1970ies and probably much earlier.