Schuberts four-hand Fugue, D. 952

The section that begins at the final keychange into F minor [halfway down page 18/19 in the Peters Edition between Q and R] certainly starts like a double fugue. You are right in that the form isn't strictly fugal but there are pedal points and stretti and as Greg says it is very exciting, especially to play with a friend! It reminds me of the fugal sections in the 'big' fantasia for mechanical clock/organ by Mozart also in F minor. This is normally played on the organ and is well worth a listen. A tremendous (IMHO) romantic fugue is that in Ab minor (great key) by Brahms, also for organ; the only fugue I know where the answer is in inversion. Of course you should be aware of the fugue that concludes Mendelssohn's supreme String Octet, written when he was 16. I have this arranged for piano duet [that's one piano-four hands] and it's the best fun that can be had at a piano.

Jeff, have you ever played the big Mozart fugue for 2 pianos? It would blow you away.

I haven't heard or played it, but I like the C major Fantasia and Fugue for solo piano. Echoes of the Chromatic Fantasy and Fugue.

Dover has a cheap edition of all the Mozart 4 hands and 2 piano pieces. Buy 2 copies and take it to school with you. Theres a good chance you'll find a room with 2 pianos in it.