Magnus Carlsen vs William James Sidis
Magnus Carlsen (IQ —) vs William James Sidis (IQ 250). Side-by-side comparison of intellect, achievements, era and cultural impact.
| Born | 1990 | 1898 |
|---|---|---|
| Died | — | 1944 |
| Country | NO | US |
| Estimated IQ | — | 250 |
| Best known for | Being the current World Chess Champion, World Rapid Chess Champion, and World Blitz Chess Champion. | The Animate And The Inanimate |
Who had the higher IQ?
Reliable IQ figures aren't available for both. The richer comparison is what each accomplished and how it changed their field.
Achievements compared
Magnus Carlsen is best known for: Being the current World Chess Champion, World Rapid Chess Champion, and World Blitz Chess Champion. William James Sidis is best known for: The Animate And The Inanimate
Different eras, different boards
The two were born roughly 92 years apart (1990 vs 1898), which matters: scientific tools, available knowledge, and intellectual culture compound. Comparing minds across eras is comparing players on different boards.
The verdict
So who was greater? The honest answer: they're not strictly comparable. By raw IQ proxy, William James Sidis edges out. By measurable, lasting influence in their respective field, both are anchors of the human record. If you have to pick one to bet civilization on, pick the one working on the problem you care about.