Ah yes, the Waltz No.2 - such a beautiful piece indeed.

You know funny story about this piece: apparently, when Shostakovich was being pressured by the Soviet to write more jazz like music, Shostakovich upon analyzing a jazz manuscript he had just purchased, ended up composing this waltz as a sort of Jazz piece. Hence those sax solos in the original orchestra version.

_{Clearly, this sounds nothing like jazz though😂! Regardless, the music still bares that strong vibe of Russian to it - beautiful nonetheless.}

Oh and about that game of yours... Brilliant! What a fun way to combine music theory and fun time! However, I am way too lazy to count evERY SINGLE bar for 3 MINUTES straight! Hopefully, someone diligent enough gets the job done.

Not sure what piano transcription you played from though, but much like you said, it would be a little difficult for someone to cheat. For example, in another piano transcription I read for the same piece, there was a little coda section with heavy tremolos in the left hand. So, yeah...