This episode's headline: OPEC: Price Free-for-All?; Fuming Over Ads; Fuming Over Subsidies; Soviet Visitor. The guests include In New York: CHARLES MAXWELL, Oil Industry Analyst; LEONARD MATTHEWS, Advertising Executive; In Washington: Dr. ALAN NELSON, American Medical Association; Rep. CHARLES ROSE, Democrat, North Carolina; Rep. TOM PETRI, Republican, Wisconsin; In Boston: TAYANA YANKELEVICH, Yelena Bonner's Daughter; Reports from NewsHour Correspondents: DANIEL DODD (Visnews), in Geneva; PETER VICKERS (BBC), in Oslo, Norway; MICHAEL BUERKE (BBC), in South Africa; KWAME HOLMAN, in North Carolina. Byline: In New York: CHARLAYNE HUNTER-GAULT, Correspondent; In Washington: JIM LEHRER, Associate Editor; JUDY WOODRUFF, Correspondent