Pallas It's the F# minor harmonic scale. Unlike the previous scales I've practiced where distance between notes are more even, this one has a couple of spots where the lateral distance stretches and contracts (D-F-F#, and D-C#-B). So, instead of wrist moving laterally at steady speed, mine kind of need to do a little stop-n-go around those spots. Then, when doing contrary motion, it become even more tricky because the stop-n-go points of both wrists do not happen at the same time. Also, because one of the stop-n-go point is right at the end of the octave, I find going from one-octave run to two-octaves run a big hurdle.
At least that's my experience. Maybe there are better solutions? I am all ears.