What's Your Favorite Obscure Piano Sonata?

[Simula]

I know, this is a tough question. Maybe list your best three if you can't decide on one. (Of course, being obscure, I think this takes Beethoven off the table). 

[Jo498]

They are at best semi-obscure, but two that come into mind are

CPE Bach: Sonata a minor Wq 49/1
C. M. v. Weber: Sonata #3 d minor (or #2 A flat major)

(next candidates would probably be Clementi, Hummel and Hyacinthe Jadin but I would have to re-listen to name specific pieces)

[Sergeant Rock]

Richard Strauss Piano Sonata in B minor Op.5


Sarge

[Simula]

This is quite lovely, and powerful: Louis Vierne 3 Nocturnes: https://www.youtube.com/watch?v=9d7R3SY7IkA

[amw]

Uh also semi-obscure at best but

Berio
Dussek Op. 77 (L'invocation) or 64 (La retour à Paris)
Weber Op. 70
Stravinsky 1924
Shostakovich Op. 61
Stanchinsky
Enescu Op. 24 no. 3
Szymanowski Nos. 2 and 3 if they are obscure enough

[mc ukrneal]

That's a tough one. It could be the Godowsky Sonata in E minor. It's got that turn of the century sound world going for it. Although, I do love Medtner's Night Wind Sonata (well I love pretty much everything Medtner). Another that comes to mind is Tyberg's Piano Sonata No.2. So I guess those are my three for now...
Godowsky
Medtner
Tyberg

[Ten thumbs]

First, one of the delights of my youth: Weber's 1st Piano Sonata.
Second, assuming Clementi remains obscure (I don't see why), his Piano Sonata in B minor, Op.40 No.2.
Third, Cecile Chaminade's Piano Sonata, which is surprisingly good.

[North Star]

Sibelius's Sonata in F major, Op. 12 is a fine piece from the early maturity of the composer.

[Florestan]

Top 5 (in no particular order)

Norbert Burgmueller - Piano Sonata in F minor op. 8
Tchaikovsky - Piano Sonata in G major op. 37b
Baldassare Galuppi - Sonata in F major, Illy 28
CPE Bach - Sonata in G minor H47, Wq 65/17
Vincent d'Indy - Petite Sonate (dans la forme classique) op. 9

[(poco) Sforzando]

Depends on your definition of obscure. I think my own Piano Sonatina, written when I was 15-16 and still under the delusion I'd become a great composer some day, should fit the bill.

I have a weakness for the Grieg E minor, and also the Clementi B minor mentioned above. The Tchaikovsky G major strikes me as the most empty, bombastic piece of crap that great composer ever wrote.

[Florestan]

Depends on your definition of obscure. I think my own Piano Sonatina, written when I was 15-16 and still under the delusion I'd become a great composer some day, should fit the bill.

Why not playing it and uploading the performance on YT?

I have a weakness for the Grieg E minor

That's a good one too.

The Tchaikovsky G major strikes me as the most empty, bombastic piece of crap that great composer ever wrote.

Ouch!... 

[(poco) Sforzando]

Why not playing it and uploading the performance on YT?

'Cause for one thing it's too hard for me now. Some murderous octaves in the finale, plus a couple of glissandos. Any pianists out there interested?

[Simula]

This is great, lots of new sonatas for me to listen to!

[springrite]

Medtner Piano Sonata #1, Opus 5
Edward MacDowell Keltic Sonata (#4)
Rochberg: Sonata Seria
Charles Thomlinson Griffes: Sonata

[amw]

The Tchaikovsky G major strikes me as the most empty, bombastic piece of crap that great composer ever wrote.

The actual musical content isn't the worst, but jesus the piano writing is awful. I can't believe Tchaikovsky, a competent (if not great) pianist whose other piano music is reasonably well orchestrated, thought that piece would sound good as written.

It might make an acceptable symphony if someone cared to take the trouble to arrange it for orchestra.

[listener]

Dukas and Grieg might be of interest.

[Dancing Divertimentian]

Hanns Eisler, 3rd sonata.

[Turner]

On top of my head, probably one of Feinberg´s,
but some of Medtner´s more ambitious ones would also have to be considered.

I haven´t heard Rochberg´s. Tippett´s 3rd is good too, for example.

[Simula]

Regarding Sibelius Sonata Op.12, I wish this had been orchestrated. You can tell the second movement (which is quite lovely) would sound far better if it was orchestrated. Where is Stokowski when you need him?

[zamyrabyrd]

Medtner Piano Sonata #1, Opus 5
Edward MacDowell Keltic Sonata (#4)
Rochberg: Sonata Seria
Charles Thomlinson Griffes: Sonata

Mac Dowell and Griffes, fascinating choices!
Do you actually play them?
I have some Griffes sheet music bought many years ago.