So I noticed this question about the basic rules of chess has a
(current) score of -3, but it has no close votes. I myself can't find
an objective reason to close it based on the current standards.
I agree. I also can't find any objective reason to close it although I see that, perhaps based off this question, 3 people have voted to close it.
The reasons for downvoting a question are not the same as those for deleting it although clearly there is some correlation. If you hover over the down button the pop-up "This question does not show any research effort; it is unclear or not useful" appears but "not useful" is not one of the reasons to delete. Nor is "does not show any research effort".
Would it be good and on-topic to have a reference question on the
essential rules of chess?
My initial reaction was that people who come here should already know how to play chess but then after reflection I changed my mind. We should be more welcoming.