Shame. I just came across a thread on t'other forum about this table:
1. lehký
Easy
Short jump (generally under 2 m) at same level or with little altitude difference.
2. stredne težký
Medium-hard
Longer jump (above 2 m) with lesser altitude difference with good take-off and good landing.
3. težký
Hard
Risky jump (above 2 m) with bad take-off or landing or with big altitude difference.
4. krajne težký
Extra hard
Gradation of precedent conditions, acrobatic effort.
5. extrémne težký
Extremely hard
Hazardous effort.
..And was wondering what grade DC10 would get. 2 maybe? Or is it a 3?
They also have a grade table for climbing difficulty, of which the hardest climbing is grade VIII:
VIII. a výše bez slovnà charakteristiky
Without verbal characteristic
Climbable only for climbers with intensive tonic and climbing training.