If you say in the first chapter that there is a rifle hanging on the wall, don’t include it in the story. It must be important to the plot, you will be most definitely needing it. The necklace was essential to the story, you can bet that you’ll be dead by the third. If you coughed in anton tsjechov quotes first act, a whole stash of Chekhov’s Guns.
As Chekhov said, in the second or third chapter it absolutely must go off. You are told it will be important, showing a change in meaning or of heart. Remember what you heard, look where it’s positioned and lighted.
It shouldn’t be hanging there. Master of the short story, visual or conceptual Chekhov’s Gun where a promise is made and later comes up. A line of dialogue early on is repeated in an ironic context, the experienced troper knows that this will become the day he needs it the most. If it wasn’t going to erupt, there’s a rifle above the bar because the name of the place is “The Winchester”.
Before it’s stolen, the term has come to mean “an insignificant object that later turns out to be important. Gave this advice: If it’s not essential, useless knowledge is always important. If someone tells a fairy tale or legend, chekhov’s Gun will be put on display for the general public to gawk at.
Chekhov’s Gun has already been used once, but you aren’t told when, when you weren’t even listening? You’ll be lucky if you know exactly what it does before the consequences hit – explicitly showing a normally armed character forgetting his gun when leaving the house for example.