British Go Journal No. 11.  March 1970. Page 1.
Individual Go players usually have fairly satisfactory intuitive ideas of what the rules of Go are, and these cover most positions met in play. There are, however, no nationally recognised rules, and what the ruling on an anomalous situation should be must be decided by the players. Provided they know the ruling, all is well, but there are several positions which would not be met with in years of normal play.