In the end, TheDarkKnightTwo won when he pretty much guaranteed either a pawn promotion or by capturing my hanging rook. After Na6, I resigned.
I had my chance when I missed a hanging pawn. Last night was so long ago, but I seem to recall seeing this move. But I didn't realize I missed it until Herr Fritz subtly pointed it out this morning. I exchanged queens, but missed the hanging knight. Of course had I seen the proper move, I was still fighting a formidable opponent who would not go down easy.