Carlsen's doubts over title defence leave chess facing uncertain future, Magnus Carlsen

The champion is unlikely to defend his title against anyone other than Alireza Firouzja, risking return to era of two No 1s

Magnus Carlsen Custom Chess Openings

Why did chess champion Magnus Carlsen give up his title? - Quora

Magnus Carlsen says he has no 'inclination' to defend his world title next year

It's official! Magnus Carlsen will NOT defend his title

2021 World Chess Championship (Carlsen vs. Nepomniachtchi) - The Chess Drum

What will it mean for the chess world if Magnus Carlsen does not defend his title? It will seem strange if the best player is not the world champion. - Quora

Five-time world chess champion Magnus Carlsen won't defend title, doesn't 'have a lot to gain' - ABC News

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2018 World Chess Championship (Carlsen vs. Caruana) - The Chess Drum