Quote:
Originally Posted by Dieter
How fast? My fastest is 1970 = 10th value of the sequence, but I search no more.

The "trick" itself is just one more degree of freedom in writing code.
Of course I can remove all "tricky" edges from my solutions; the easiest way requires to keep the same number of incoming/outcoming edges by adding suitable nodes as new sources/destinations, which means some more CHAOS lines.
As an example, the length of my 7step bonus solution grows from 17 to 19, not a problem, but I judge the "tricky" version more efficient.
So far, I found no "untricky" solutions which fit both the 6step and the 20line constraints.