It exists, and has existed, for a long time. I’ve wanted to see a production of it, but I’ve never been able to catch it anywhere.
Involved: Bjorn Ulvaeus and Benny Anderson formerly of ABBA and Tim Rice. Yes, those guys.
What most people don’t realize is that they’ve most likely already heard music from it.
One Night in Bangkok and I Know Him So Well are both from Chess.
I’ve been listening to the double album for well over a decade now and didn’t realize that there’s a “new” supposedly official version that premiered as a concert DVD. I’d like to check that out once it comes out. Gives me some hope that I’ll be able to catch a production at some point.