Bs"d
He was just plain crazy.
But the best chess player of all time.
What he has shown no one after him ever repeated.
Winning the USA championship with 11/11 (+11−0=0), beating Taimanov and Larsen with 6-0 in the candidates, nobody ever came close to stunts like that.
The gap between him and the rest of the world was greater than with any other player.
Look how hard it was for Kasparov to beat Karpov. They played like a 100 games against each other, and what was the difference? One point, a half point?
He's a legend.