ORIGINATING in China as Wei-ch'i as early as 2356BC, according to some sources, the board game called Go demands great skill, strategy and patience The rules are so simple even children can play and there are special handicap rules allowing players of unequal skill to participate. The game, for two players, is played with 181 black and 180 white flat, round ''stones'' on a square wooden board which is checkered by 19 vertical lines and 19 horizontal lines to form 361 intersections. Each player in turn, first moves a black stone on the point of intersection of any two lines. Players then try to conquer territory by enclosing vacant points with boundaries made up of their stones. A player's final score is his/her number of walled-in points less the number of his stones lost by capture. The Regional Council, the Urban Council and the Hong Kong Go Association are jointly presenting ''Go Training Courses 1993'', from September 26 to October 17. The course will be held on Sundays from 3 pm to 5 pm at Queen Elizabeth Stadium and is open to anyone aged eight and over. Entry fee is $15. Application forms are available at the Hong Kong Go Association, 1/F, Wang Kee Mansion, 252 Hennessy Road, Wan Chai. For information, call the association on 893-9157.