Zoltan Ribli (6 September, 1951-) is a Hungarian chess Grandmaster and writer, arbiter, twice Junior European Champion, three times Hungarian Champion, chess Olympiad winner.

At the 1968/69 Niemeyer Tournament in Groningen – same ranked competiton as the Junior European Champonship - he tied for 1-3^rd place, in 1970/71 he became a Junior European Champion.

He was awarded the International Master title in 1970, earned the International Grandmaster title in 1973. He won the Hungarian championship on three occasions: in 1973, 1974, 1977.

He participated in the world championship tournaments on several occasions. At the 1978 world championship cycle, winning the Reykjavík Zonal of 1975 he advanced to the Manila Interzonal 1976, where he tied for 5-6^th place.

At the 1981 world championship cycle he won the Warsaw Zonal qualifying himself to the Riga Interzonal and tied for third place with András Adorján. In the playoff match they played a draw, but with his better point-calculated performance Adorján advanced to the Candidate stage.

At the 1984 cycle, he won the Zonal tournament in Băile Herculane, in 1982. Then, he earned first place at the Las Palmas Interzonal, advancing to the world championship Candidate’s. In the quarterfinal he beat Eugenio Torreto 6-4 (+3,-1,=6), in the semi final he lost against the former World Champion, Smyslov, by 4,5-6,5 (+1,-3,=7).

At the Soviet Union vs. Rest of the World match of 1984, held in London he beat his opponent, Rafael Vaganian, by2,5-1,5. (The Rest of the World team lost to 19-21.)

Between 1970 and 1994 he represented the Hungarian national team on 12 occasions at ChessOlympiads. Playing all 145 matches his record is 49 wins, 88 draws and only 8 losses. He was a member of the Hungarian team, which won the Buenos Aires Chess Olympiad in 1978, breaking the Soviet hegemony lasted two decades. In 1970, 1972 and 1980 he won silver medals all three times with the Hungarian team.

At the 1985 Team World Chess Championship he won a silver medal, giving the best performance of the field.

He participated in several European Team Chess Championships, in 1977 and 1980 he earned a silver medal, and in 1983, he won a bronze.

He is more active in team tournaments recently, and participates in individual events less regularly. He is now a trainer in Germany and Austria. He was a coach of the Austrian national team at the Chess Olympiad 2008.

He is an international chess arbiter from 1955.

As a chess writer, his contributions and articles have been released in many chess magazines around the world. With the chess Grandmaster Gábor Kállay they cooperated in several books such as the famous Winning With the Queen's Indian and the Winning With the English.

According to the Chessmetrics historical rating his highest score is 2730.

Sources: https://hu.wikipedia.org; http://www.chessmetrics.com