07/20/2021 UPDATE: This is cooked. 1. Qd6+ works just as well and is simpler. (Thanks, Travis.)
07/20/2021 UPDATE: Blimey, doubly cooked! 1. Rc3 works too. (Thanks, Chris.) And the pawn seems to have no role in any of this, not even in Carney’s intended solution. Not sure how Wadworth can have chosen this without noticing the errors — but I guess I just did the same thing!