Hi,
how would you set up an algorythm for detecting an Open-Test-Drive or an Open-Drive?

In https://www.linnsoft.com/homework it's written that OTD is more difficult to evaluate, and I think the same. I watched 90% of the videos in the page without finding a direct answer but I think that a viable approach could be evaluating the size of the first two zig-zags (the second one should be a big one relative to the "normal" harmonic rotations).
To keep a light approach, I'd not delve into detecting which previous level is actually being tested (with for example Pivot Strategy).

What do you think about?
Thank you!