Do you need really high IQ to be great at Chess?


High IQ will let you improve faster, but it doesn’t necessarily mean it will make you great.
Your greatness depends on your investment of time and energy to learning and improving in chess.

Look at this game:
GM Perelshteyn vs. GM Carlsen:
https://www.youtube.com/watch?v=f-8x6qVg5Jg
In the game, since GM Perelshteyn is also an openings master, Carlsen got into trouble with his king, But... he managed to get out of it, and win the game, due to his calculation ability. - that's not normal.
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Now look:
Magnus Carlsen Takes the 100 Endgames Test!
https://www.youtube.com/watch?v=k1SCXb2WA2U
minute 25:20
he inserts the position into his head, closing his eyes for a few seconds, and then solves it in about 5 seconds - that's not you and me. - that's a super brain - when I close my eyes I see a black screen.
These are endgames which he never studied...
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The defence rests

I hate when people believe that being good at chess and high IQ are inseperable. No, they are not. Just like in any other activity, having a high IQ is a big boost and helps a lot, but its not neccesary to play chess. And it goes both ways. Just because you have high IQ it doesn't mean you will be great chess player. People with high IQ tend to be better at almost everything they try compared with regular folks. That is how it goes. Playing chess has to be separated from how smart (or how high your IQ) is.

Firstly, it's debatable whether IQ tests measure anything other than how well someone performs on IQ tests. It's possible to improve at IQ tests with practice, and populations overall tend to improve in line with economic development. None of this should be the case for an objective measure of brain "horsepower".
Secondly, one extrapolation that often leads to bad conclusions is pulling inferences from world-class athletes / players etc to make overall broad statements.
The very best chess players are indeed very intelligent with super-human pattern-recognition, visualization and calculation skills. However, it's also the case that chess is 99% about how much you've studied. The guys who believe chess is about intelligence are usually the guys who end up rage quitting because they take losses personally and don't study what they did wrong.
It's only at the very top echelons of the game where the 1% starts to matter because all professional players will have maxed out the study component.

Having a high IQ implies, mainly, that the player can learn faster and easier. Theoretically speaking, we can assume that a "brilliant" player can reach a high level of play in a shorter amount of time.
Though I'd argue that a player with a "normal" IQ can still reach that same level of play. They may simply need more time and effort to do so.
Going back through the great players of the past, you'll see that, in nearly every era, there were "brilliant, natural" players and "studious, workhorse" players - both of whom reached dizzying heights.
There's a natural fascination with the "brilliant" players, as their dominance seemed effortless. Though I find the "workhorse" players more impressive, as their accomplishments were harder to earn.

I mean, I don't think someone with a really low IQ would ever be very good at chess, but no I don't think chess ability and IQ are a 1:1 correlation either.

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"I have no idea. People who boast about their IQ are losers."
-- Stephen Hawking, on being asked about his IQ score.

Firstly, it's debatable whether IQ tests measure anything other than how well someone performs on IQ tests. It's possible to improve at IQ tests with practice, and populations overall tend to improve in line with economic development. None of this should be the case for an objective measure of brain "horsepower".
Secondly, one extrapolation that often leads to bad conclusions is pulling inferences from world-class athletes / players etc to make overall broad statements.
The very best chess players are indeed very intelligent with super-human pattern-recognition, visualization and calculation skills. However, it's also the case that chess is 99% about how much you've studied. The guys who believe chess is about intelligence are usually the guys who end up rage quitting because they take losses personally and don't study what they did wrong.
It's only at the very top echelons of the game where the 1% starts to matter because all professional players will have maxed out the study component.
I wouldn't say as much as 99% of your chess skill comes from study. I've studied nothing but basic opening videos on YouTube yet I've still made decent progress. Factors such as skills in calculation, memory, and time management also come into play. If anything, training and experience are what makes the most of your overall skill in chess.

Then someone gets into time trouble trying to remember what he's studied while he's getting punched in the face

Then someone gets into time trouble trying to remember what he's studied while he's getting punched in the face
Hah! Works both ways, though.
A player can get into trouble trying to figure out what to do ... when they'd have known the best move, instantly, had they studied the position beforehand ...

135 is still huge
Bobby Fischer had an IQ of 181. And Garry Kasparov had an IQ of 190. This is near the highest bracket of Intelligent Quotas in the whole world.
And these are the two greatest players chess has ever seen (besides Karpov, but I could not attain any IQ information by him )