capablanca petrosian andersson
GM who lost the least?

From chessgames.com (exhibition games excluded)
Capablanca: 7.01 %
Kasparov: 7.29 %
Petrosian: 8.16 %
Kramnik: 8.89 %
Spassky: 9.63 %
Karpov: 9.88 %
Tal: 11.07 %
Anand: 11.26 %
Fischer: 11.35 %
Smyslov: 11.84 %
Botvinnik: 11.97 %
Alekhine: 13.83 %
Lasker: 14.83 %
Euwe: 16.21 %
Steinitz: 24.51 %
Carl Schlechter should be included at 14% loss.
https://www.chess.com/games/search?opening=&openingId=&p1=Carl+Schlechter&p2=&sort=
You are really funny, Capa only lost 34 games, maybe the guy who lost the least games.