connective N1 rare writtenliterary
〜ばこそ — precisely because ~ / it is exactly because ~
〜ばこそ ・ ばこそ
Builds on 〜ば
A full written guide for 〜ばこそ is on the way.
This point is mapped in the grammar tree, but its examples, formation table and usage notes haven't been written yet. The fastest way to learn it now is to meet it in real sentences inside Jengo.
See 〜ばこそ in real sentences
Jengo shows 〜ばこそ the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.
Study it in JengoSources Compiled with reference to A Dictionary of Advanced Japanese Grammar.