The professional sumo (Japanese wrestling) tournaments staged annually in January and May at the Kokugikan bowl at Ryogoku, Tokyo, will be held for 15 days or an extension for two days beginning the tourney in May, it was formally announced by the Japan Sumo Federation Wednesday night.
    Action was taken by the Association with the view to giving more Tokyo residents a chance to see the matches.
    The tourney was extended to 13 days from 11 days in 1937 because of popular demand.