Once I accepted to close this wB in the try, the passive role of preventing check never came to my mind.
Instead, I liked to accent the diagonal a8-h1 with two corner-pieces and with wR & bK in the center.
Then, Vasil Dyachuk asked me about the version above, and I understood how differently we see some little details,
when we turn from mechanism to illusionism. Thanks, Vasya!