What is "jubango"

Jubango (十番碁) is a Japanese term for a Go match consisting of ten games which might be ended earlier if agreed by both players. A decisive victory would result in the opponent being ' beaten down' to a lower rank. A player would be beaten down if he fell behind his opponent by four wins in the net score. This would mean a change in the playing terms corresponding to a handicap suitable for a rank difference of one rank. Some notable historical Jubango players are Go Seigen, Kitani Minoru and Honinbo Shuei.

These matches were usually spread over long time-periods, with gaps of months possible between games. They were also peripatetic (taking place in different venues). Both of these features make them different from modern mind sports matches, which tend to be held over a short time in a definite location. Modern go title matches have adapted these characteristics of a jubango.