We don’t have an official posting about it, though I’ve been wondering for a while if I should make one. I think Martin maybe explained the details here and there on the former discord server, but it was never all gathered all in one place.
I do have it all written down, since I double-check things while the contests are ongoing and also shortly before results are announced. (And I’ve manually double-checked the results after they were announced in previous contests, too, to make sure there weren’t errors. I wanted to make sure I could replicate the math and ensure there weren’t any glitches…)
Pretty much, final scores for all challenge stories are auto-calculated by the site’s challenge-scoring algorithm, which Martin wrote. The scoring algorithm combines a story’s unique Favorites + the story’s top four Rating Categories (aka, categories such as Hotness, or Idea, or Mind Control) and plugs them into a detailed formula, which then crunches it all into a single final score.
In terms of terminology: by ‘unique Favorites’, I mean that if someone reads a multi-chapter story and only Favorites the first chapter… then it will count just as much as if that same reader also Favorited every other chapter too. Meaning: it’s less about how many overall chapters got Favorited, and more about how many individual logged-in readers left a Favorite on the story. (Also, just a note that the algorithm maxes out at 100 Favorites, so it won’t count additional Favorites past 100.)
And, when I say ‘top four Rating Categories’, I mean that the score algorithm considers only the four highest-rated categories (such as Idea, or Hotness, or Mind Control) of a challenge story. A story’s weakest categories won’t be counted against it! And for multi-chapter stories, the top four Rating Categories can come from any chapter — so, if one chapter does really well in Idea, and another chapter does really well in Hotness, the final score will take each individual Rating Category from whatever chapter did that category best.
Note, also, that this doesn’t actually favor multi-chapter stories over standalone stories. On one hand, you might think that multi-chapter stories have more ‘chances’ to get high Rating Categories with each new chapter they post… But in reality, a Rating Category’s ‘weighted’ score goes up the more users there are who rate it well. So, I’ve seen that multiple-chapter stories often risk getting fewer readers voting on each chapter (both due to longer length, and also the fact that readers don’t always read and rate every chapter). And with fewer readers, you get fewer concentrated ratings, and that can dilute and weaken your Rating Category scores…
In practice, though, I’ve found that any potential advantages and disadvantages between the single-chapter vs. multi-chapter approach appear negligible. Just looking at past challenges, there are examples where standalone stories beat out some really strong multi-chapter contenders, and vice-versa. I’ve been keeping an eye on it, and I haven’t noticed any system-based advantage to either approach.
I hope this helps clarify things!
And let me know if there are other questions on this, or anything above that could benefit from clarification! (And maybe later I’ll collect all this information into the Challenge Help Desk thread, for future reference…)