Piano begins development with a tritone figure similar to the start of the 2nd exposition
Beethoven begins on an F, taking us abruptly away from D major and into F minor
There's a combination of triplet and motif x rhythms
Pianissimo dynamics, then we move into D minor and suddenly into B minor
Woodwind develops motif x while violins and cellos copy the piano's triplets
Then there is the circle of 5ths (B minor to F# minor to C# minor)
Highly virtuosic for the piano, rhythmically complex and punctuated by chords from the orchestra
It's fantasia like, repeating short motivic ideas with lots of chromaticism, building to a climax in bar 227
It then reduces to trills that move us into the final section of the developments
Still in C# minor, the longest lasting tonality of the development. (but the most remote key from the tonic - tritone away)
Basses play x motif rhythm
5 note descending scales in piano take us into E major
Woodwind bring in motif x over the piano triplets and a brief fugato begins with a fugal subject into piano
At this point we are back in the tonic and its characterised by trills, scales and off beat accents
Woodwind play a countersubject as the lower strings take on the subject melody with the counter subject moving into the horns
Piano still plays triplets, motif x reappears In the orchestra (bar 248) and tension builds with crescendos, rhythmic diminution, sforzando chords signalling return to the opening material