Boden's Mate Again

I've posted about Boden's Mate here before. I got a chance to play it again in an online blitz game in the following position.  Yes, White is down a ton of material; he was one of those players who, well, Dr. Eliot Hearst once wrote a column for Chess Life and did an article on a 'chess dictionary' where he gave the following definition:  Resignation - a way of ending a game unknown to weak players. See if you can spot the mate...you have 2 seconds.