One of our acrotumblers tried this crazy skill the other day.
He under rotated to prone fall.
Perhaps only two female artistic gymnasts have ever competed it.
Click PLAY or watch Tatiana Groshkova on Floor (1990) on YouTube.
Click PLAY or watch Alexis Brion (1995) on YouTube.
Thanks M.L.
=== UPDATE:
From George Novak:
Alexis did it in a pike position. I think she might be the only one that can make that claim. Certainly one of the biggest if not the biggest backward tumbling skill ever performed in competition on floor by a female gymnast. I have some old videos of her at home somewhere accidentally pulling off some pretty impressive triple full-ins into the pit while learning it (getting lost LOL), aged about 10.
Gymnastics Coaching.com 