From memory there were quite a few gen entries last year. When you sign up you list three pairings and you can state if you want gen and/or what rating (for example last year I chose Sam and Dean, gen. AU Jared/Jensen or gen, but not NC-17. Sam and Jess or Sam/Jess, but not NC-17). You also get to list things that you 'can do' and things that you 'cannot do'. So if you want gen only, you can ask to receive that and write for that, and you will be matched accordingly.
Last year I was lucky and got a match on three of my pairings, so I could chose which one to write. You will always get at least one pairings match when your assignment is issued.
Another great thing about this challenge is that the fics are initially posted anonymously, so any one could be writing anything! This creates a lot of excitement and guess work. The authors are them revealed at a later date.
I really enjoyed the challenge last year. I ended up writing a pairing I'd never written for before and also a new trope. I hope this helps.
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Last year I was lucky and got a match on three of my pairings, so I could chose which one to write. You will always get at least one pairings match when your assignment is issued.
Another great thing about this challenge is that the fics are initially posted anonymously, so any one could be writing anything! This creates a lot of excitement and guess work. The authors are them revealed at a later date.
I really enjoyed the challenge last year. I ended up writing a pairing I'd never written for before and also a new trope. I hope this helps.