"Here you have a sonata that will be a hard nut to crack; pianists will grit their teeth from it for another 50 years". 200 years later, pianists still grit their teeth from Beethoven's Hammerklavier sonata, and it stays quite a hard nut to crack!

A few recordings to check out:

https://spoti.fi/3k5hUQy

https://spoti.fi/2OLydX5 (part 6)

https://spoti.fi/2NOlYsA