Like the previous one, this championship cycle contained two
Interzonal tournaments, held in
Rio de Janeiro in September and
Alicante in October 1979, featuring the best players from each
FIDE zone. A total of 35 players took part, with the top three from Rio (17 players) and the top four from Alicante (18 players) qualifying for the Candidates' matches. Ioseliani won convincingly in Rio, 2½ points ahead of Veroci-Petronic and Alexandria. In Alicante, Lematschko and Akhmilovskaya shared first place, well ahead of Gurieli and Litinskaya. However, Lematschko subsequently defected from socialist Bulgaria and was unable to take part in the Candidates' matches, so her place was given to Fischdick as fourth-placed from the Rio Interzonal (on tie-breaks). Lematschko later settled in Switzerland and reached the Candidates' matches again in the following cycle, representing her new country. : : ==1980–81 Candidates' matches==