The Tkatchev, named for Alexander Vasilyevich Tkatchev, is also known as a reverse hecht. At its most basic definition, it’s done from a back giant swing, involves a release backwards and over the bar, and is caught again on the other side. Where it gets interesting is the entry (i.e. from a stalder, inbar, toe-on, or clear hip instead of a giant) and then the body position in the air (i.e. straddle, pike, or layout). Here’s a handy chart I made to help with the variations.
Unfortunately Durban did not include Gymnastics in their bid because they had no suitable venue. Durban Gymnastics coach Jesse Kitzen-Abelson says Gymnastics can still be added. My guess is that it will.
UPDATE: Over on the private Gymternet Clan Facebook group, there’s much discussion on that topic. The proposal in the works would require Commonwealth Games to include 16 mandatory sports, one of them Artistic Gymnastics.
On vault, the big news is the fact that the Yurchenko layout full (a round-off onto the board, back handspring onto the table and a layout with a full twist) and Yurchenko layout-half have been devalued to start from a 9.95 …
… vaults that are still valued at a 10.0 start value. For example:
Front handspring pike-front half
Tsukahara (cartwheel or half turn entry directly onto the table) layout full or layout half (or Phelps, 1/2 turn to Front Layout)
Yurchenko or Tsukahara tuck 1 1/2
Omelianchik (round-off half turn to front pike) and Podkapaeva (round-off half turn to front tuck 1/2)
Tuck or pike Luconi (round-off backhandspring with a full twist on, back tuck/pike off)
Pike Ilg (front handpring onto board, front pike off)
Of course finishing the Blind Change before doing the release makes the variation far easier. Neither should or could be called “full twisting Tkachev”. (Ask a gymnast who can actually do a full twisting Tkachev their opinion on Shushunova release.)