Best chess player with Down Syndrome Who is the best chess player with Down Syndrome? Wiki says that the mental ability of a person with Down Syndrome equals to this of a healthy person 8 or 9 years old. So, are there some players with this syndrome, as there are many admirable healthy players at the age of 8-9?

What is the elo ceiling in that case? Is it possible a "Magnus Carlsen with Down Syndrome" to get in 2000 or 2200 elo?

What about other types of intellectual disabilities?
There are a lot of titled players with high functioning autism.

One known is GM David Navara, but there are others. It is discussed if Bobby Fischer was Asperger too. There was a buzzing Magnus Carlsen was autistic too, but looks false according to Quora. Another example of GM that looks to be autistic is GM Julio Granda from Peru.

As for Down Syndrome, they have not the abilities an Asperger has, but they can learn how to play chess competitively.

Subramaniam Karaan, from India, has Down Syndrome, and he is rated 1806 when I write on FIDE list. He is also rated 1832 in blitz, and was close to reach 2000 in 2015.