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Walker used his column in Bell 's Life to propagate organizing the international London 1851 chess tournament , the first international chess tournament .
 person: Walker
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Walker 
Answer:
 person: Walker