This episode's headline: Threats to Peace; A Big Gamble; In Memoriam. ANCHOR: JIM LEHRER; GUESTS: RAY O'HANLON, Irish Echo; TOM RHODES, Times of London; FRANK FAHRENKOPF, American Gaming Association; BERNIE HORN, Anti-Gambling Coalition; MAYOR A. J. HOLLOWAY, Biloxi, Mississippi; MAYOR CHARLES TOOLEY, Billings, Montana; KEN AULETTA, The New Yorker; CORRESPONDENTS: CHARLES KRAUSE; ELIZABETH FARNSWORTH; SPENCER MICHELS; MARGARET WARNER; TOM BROKAW