Chekhov's gun is the literary technique the essence of which consists in the fact that in the beginning of the story to mention in passing anything and do not reveal its value until the very end. In fact, Anton had in mind a very different not necessary to include in the story elements that are not necessary. But his words were misunderstood.
Often the quote about the gun Chekhov POPs up in discussions about plot holes.
In many of the early plays Chekhov technique was used to re-specify. It consists in the fact that history periodically mentions a character or an object seemingly at the first mention minor but in the end unexpectedly influence and interchange.
Sometimes the viewer can stick his nose under the gun hinting that it will emerge in the future, but doing it for the sake of breaking