Ask HN: Need ideas about good recommendation system for matchmaking

There is no such thing as "good matchmaking". Because intentions of both sides are different and it's a zero sum game where secret of skill is making the most plausible pretense that your intentions are not what they are, dating skill is about misrepresenting oneself. A "good matchmaking" is about "finding a good partner for both sides", if some app did that, no one would use it.