Both Uses of

loophole
in
The Brothers Karamazov

So then there are loopholes, after all, to creep out of the hermitage to the ladies.†
Chpt 2 *

loopholes = things left out of a rules that make it possible to evade difficulties or obligations

This Korneplodov, after questioning him minutely, and inspecting the documents he was able to bring him (Mitya alluded somewhat vaguely to these documents, and slurred over the subject with special haste), reported that they certainly might take proceedings concerning the village of Tchermashnya, which ought, he said, to have come to him, Mitya, from his mother, and so checkmate the old villain, his father ..."because every door was not closed and justice might still find a loophole."†
Chpt 8

loophole = something left out of a rule that makes it possible to evade a difficulty or obligation

Definitions:

(1) (loophole)
a gap in a rule, allowing avoidance of the rule's core intent -- especially in the text of a law or contract
(2) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Less commonly, loophole can refer to a small opening in a castle that provides light and air, and allows an arrow to be fired from within. The opening is narrow enough that it is largely protects from incoming arrows.