[awahab92]

magnus carlsen basically quit because computers ruined chess. As did kasparov.

Fischer was probably the last great player who was unassisted by tools.

[karmakurtisaani]

Carlsen plays still at the highest level. He just didn't want to do the world championship anymore, wasn't worth the effort after winning it so many times.

[hyperbovine]

?? Carlsen is very much active -- look up the YouTube channel EpicChess for an extremely entertaining recap of what he's up to recently.