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Short answer: yes, with measure and forethought. Note #1: unless karma and universal balance is a defining characteristic of your world, previous bad luck does not count. That's just how our world...
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Source: https://writers.stackexchange.com/a/44105 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/44105 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Short answer: yes, with measure and forethought. Note #1: unless karma and universal balance is a defining characteristic of your world, previous bad luck does not count. That's just how our world works. Note #2: there are great examples of book that handle great moments of luck, and base their entire plot on it. I am guessing this is not the case in this question, and that the stroke of luck mentioned above is merely being considered as a lesser plot device. ## First and foremost: keep luck reasonable. Luck should serve merely as an input, or a very small step towards the MC goal. Be careful to not make it into the meaningful event that allows reaching the goal: while being great, luck has the unfortunate habit of removing the conflict with the world that you have built in your story. Too much of it and you throw a well crafted plot into a flat and dull series of pointless events. For instance, if the MC is out of money, you could make them win the lottery with a ticket they find in the street, or you could get them to find a lost wallet with very little money in it. It is also true that luck can get greater as time passes, see the next section for this. ## Second: make your MC deserve their luck. This is also about conflict. If the MC does not try hard to get somewhere, then they probably do not deserve to get there. If it has to happen anyway, then see the next section. From a reader's perspective: what am I reading if they struggle to achieve X but they get Y instead, which is great, but not what I have been rooting for? You need to build expectation. The greater the expectation, the greater the relief when a bit of luck helps the MC. If your novel is a 800 pages book about a poor person trying to get through in any possible manner, then yes, it is acceptable to win the lottery out of sheer luck on page 790. ## Third: Get more conflict out of each stroke of luck. Usually luck removes conflict, removes struggles, and flattens an otherwise multifaceted plot. To avoid this you can add more conflicts and struggles for every lucky moment. Build them out of the envy of less fortunate characters. Make sure that the MC know that their luck is someone else's misfortune, and make them sorry for it. For instance, if you want to make them rich by winning the lottery, then make them alone.