OK, I will voice a contrary opinion, if the alternative is that lots of posts start getting "summarily deleted".

There are plenty of good replies that are, say, just slightly under the length of the text being quoted. If you start making rules like "OK, the reply has to be at least 50% of the length of the text being quoted," then it just gets silly. I've seen people on other forums make perfectly good comments that they then had to manually pad out in order to get past some automatic threshold of exactly the kind you describe, leading to threads that are actually harder to read than they would be otherwise.

Yes, people shouldn't lazily quote whole posts to add one line of comment. No, moderators shouldn't start instituting some zero-tolerance rule that leads to people living in fear of their replies not being quite long enough.

The moderation on ChessPub has been pretty light-handed to date and I like it that way.

Do not quote a post if your reply is not going to be at least as long as the text you quote. Posting a sentence or two in response to five quoted paragrapghs is lazy and a dreadful abuse of space here. People with half a brain can scroll down and read the post you're replying to, you know?

Just use the name of the person to whom you reply.

Nota bene, because unless there is a great upwelling of contrary opinion, I plan summarily to delete any future offending posts.