Which unfinished compositions did Sergey Prokofiev leave behind?

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Portrait of composer Sergey Prokofiev, circa 1938, wearing round glasses, a suit, and a tie, looking slightly to the side. — Sergey Prokofiev Sergey Prokofiev.

At the time of his death in 1953, the Russian composer Sergey Prokofiev left behind several unfinished works on his desk. These included:

Sketches for a 6th concerto for two pianos
A 10th piano sonata
An 11th piano sonata
A solo violoncello sonata

Additionally, during his career, Prokofiev had previously projected a comic opera titled Khan Buzai, which was based on Kazakh folktales but was never completed.1