From Chapter 6, The Second World Championship, where MMB first gives some background:
After giving the 1974 and 1977 results, and the demonstration game between KAISSA and Chess 4.6, Botvinnik mentions OSTRICH as being unique for being a portable microcomputer [which crashed in Round 3], and then turns to the "spectacle" of the WCCC. I emphasise his concluding comment here:The First World Championship contest among chess playing programs took place in Stockholm in 1974, under the aegis of the IFIP (the International Federation for Information Processing). The winner was the Soviet program KAISSA.
The history of chess tournaments among computers begins in 1970, when the first U.S. Championship was held in new York, timed to coincide with the annual meeting of the ACM (Association for Computing Machinery). Since then, these championships have been conducted annually.
World championships for computers are held triennially, as they are for humans. The second was held in August 1977 in Toronto, Canada.
These contests demand a substantial financial outlay, in machine time and communication channels. Therefore they are usually conducted on the Swiss system, in four rounds. The time limit is set at 20 moves per hour.
Botvinnik then mentions a bit more about PIONEER, and then turns to the WCCC and ICCA formation.A championship contest among computers is an engrossing spectacle. The authors of the programs sit at chess boards. Using video terminals, they inform their own distant computers of the moves made by the opponent. The computer's answer is displayed on the terminal and echoed on the chess board. While waiting for the answer the scientists visit amicably among themselves, analyze positions, argue, joke, and often criticize the performance of their own programs. This is all quite understandable: a computer tournament is only formally a sporting event---in essence, it pursues scientific aims.
The third World Computer Championship will be held in 1980. [...] At the end of the Toronto championship, the competitors---the authors of the programs---took part in a conference in which the Dutch programmer B. Swets called for the formation of an ICCA (International Computer Chess Association). This was approved in principle. A sign of the times!