Interesting problem in a sense of tactics and development of the set theme. Double quiet thematic threat transforms into 2nd moves and defenses in the threat – into variations.
Unfortunately the author “mixed” the idea and didn’t separate variations. The problem would be much better if the moves of threat execute in response to another defenses and Black thematic moves – with another White answers (of course, with the same interesting tactics) or strictly paradoxical Dombrovskis answers from double threat in response to Black defenses.
In any case it is the most interesting problem of the tourney.