A couple of pics as promised. Nothing too glorious; but hopefully something a with a little insight;

pic 1 : the whole shamozzle. How it locked up, how I came to a stop, how I carried the bike home and how I was able to take the photo

pic 2 : the chain post mortem. though it's a bit dark, the master link is actually to the right of the shot.

pic 3 : the whole sorry mess of the chain & sprocket immediately before disection. note that the one loose end of the torn linkage shown in the previous shot is flipped up and gives you a better orientation.