Half Link Chain Stretch

I know my chain is worn when the cog is so backwards my tire ends up rubbing the mud guard... probably nowhere near going to come off but annoying.

The single-link KMC that came with the charge hob had a link removed after 500 miles but it's now worn again. It was fine single-speed but once I went fixed you could nearly see it wear.Time for a new chain, chainring and cog!

FTFY, and if your chain is so worn you've already removed a link and it's worn further then a new chain isn't going to cut it, your cog and ring will be so worn that a new chain won't run smoothly at all.

The time for a new chain is not when the current one is fucked beyond recognition, it's already too late by then.