Estimating Magnus Carlsen's IQ
For whatever reason the commonly accepted IQ of magnus carlsen is 190 - I think this is because people seem to think chess is highly g-loaded, when in reality it is not (r = .32 in unranked samples). Even if you make some generous assumptions about measurement error, I doubt the true correlation is higher than .45 in random people. Notably, Kasparov's IQ was tested at 135, vindicating my belief that a lot of these IQ estimates of prominent scientists/politicians/chess players/philosophers are bogus.
Magnus Carlsen currently stands as the best chess player, putting him at a z-score of 5.93 in chess skill (assuming pop of 605M).
Apparently Carlsen reached #10 out of 7M in fantasy football, a z-score of 4.68.
Currently assuming a g-loading of the rank of fantasy football of 0.4, and a g-loadedness of chess skill of 0.4.
Based on simulations, the mean and SD in IQ of a person with that rank in fantasy football is about 2.1 and 0.86 in z-score notation. Regressing his chess rank onto that yields an estimate of 151.
Magnus is also a pretty good poker player so maybe that will help you refine his score. I wonder if shorter time formats are more or less g-loaded. Probably Fisher Random chess is more g-loaded as it doesn't use memorized opening knowledge.