24453
Not many grandmasters were allowed to emigrate , and after Viktor Korchnoi defected in 1976 , the door was almost completely shut until the fall of the Soviet Union 15 years later .
 nationality: Viktor Korchnoi, Soviet Union
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
Answer:
 nationality: Viktor Korchnoi, Soviet Union