52347
He applied principles of fuzzy logic to improve its play between phases , and by July 1979 , BKG 9.8 was strong enough to play against the reigning world champion Luigi Villa .
 Luigi Villa
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Luigi Villa