Challenge: Turn WW1 into a Pyrrhic Victory for the Central Powers

I've seen a lot of posts about WW1 ending in a Central Powers victory. I'm going to put a little twist on this: the challenge is to have WW1 end in a Pyrrhic victory for the Central Powers.

I'm essentially asking for a plausible series of events where the Central Powers DO win WW1, but it's at such a high cost that it is tantamount to defeat.