Emil was in both SHQ and Energit and for that reason his solo material only begins with the folk-inspired jazz piano work (included below). I was shocked to see that his Mini Jazz Klub, the unlucky 13th, was never ripped, given the strength of the popular "Window" (Okno) album. (It will be obvious when you hear it the reason why.) Note that the great team Frisell / Driscoll / Johnson as backup (on both Window and Door) appeared with Michel Herr in the amazing Good Buddies record that I've raved about so much.
With regards to the 1977 EP we have side a with a presumably nonce group called Trio 74 playing a Chick Corea composition I've never heard of before, for good reason, and side b with Emil on piano solo, the first track (Zelený Satén) is familiar as an unplugged of the fusion version from the Energit MJK release, the second track is his homage to Chick Corea:
Which indeed recalls Chick's 'songs for children' pieces.
When all is said and done, Emil's greatest work was clearly with Energit, with Okno coming in as pale second or third place finisher.
From the sleeve notes: Track A recorded live at ČAJF (Czechoslovak Amateur Jazz Festival) Přerov 1974. Side B recorded at the Czechoslovak Radio Brno, May 1976.