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

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World chess champion won't defend title because he 'does not particularly like it

Who would be the best competitor for Magnus Carlsen in a future World Chess Championship, and what style of chess could be dangerous for him? - Quora

Magnus Carlsen will not defend his World Chess Championship title in 2023, Magnus Carlsen

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Carlsen may not defend world chess title unless he faces Firouzja

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