I should charge for lessons

Every grand master that has beaten Carlsen since becoming world champion in 2013:

Viswanathan Anand

Levon Aronian

Bu Xiangzhi

Fabiano Caruana

Jan-Krzysztof Duda

Andrey Esipenko

Alexander Grischuk

Jon Ludwig Hammer

Sergey Karjakin

Vladimir Kramnik

Shakhriyar Mamedyarov

Arkadij Naiditsch

Hikaru Nakamura

Ian Nepomniachtchi

Yannick Pelletier

Teimour Radjabov

Richard Rapport

Ivan Saric

"W"esely "S"o

Veselin Topalov

Maxime Vachier-Lagrave