TherapieGo:
Admittedly, the sequence starting with C19 is inferior because it can only lead to a better seki and is therefore inferior to the sequence starting with C16 ... BUT it deserves at least to be added for the "research" aspect ^^. Here's an example of one of many possible sequences that leads to a seki ^^ : C19->C16->D19->C17->B19->E19->F19->A18->C15->B15->A16->A15->B14->B16->A14->A17->H19

Dwalkerh:
C19, C16, D19, C17, B15

TherapieGo:
Top left: The sequence that begins with C19 or D19 also works. I'm not writing down everything that is possible because there seem to be quite a few sequences but I'm pretty sure it works.