幸さいわいする

suru verb (special)

prove fortunate; turn out well; work out favorably

Used when a situation or condition ends up being advantageous or lucky, often with a nuance of 'fortunately' or 'luckily'. Commonly appears in the pattern ～が幸いする or ～が幸いして.

• 雨あめが幸さいわいして、人ひと出でが少すくなかった。

  The rain turned out to be a blessing, and there weren't many people out.

• 彼かれの経けい験けんが幸さいわいして、問もん題だいはすぐに解かい決けつした。

  His experience proved fortunate, and the problem was solved quickly.