There has been a change of heart due to more study. Tarbosaurus has been resurrected from the grave, so to speak. It now seems that there are characters that make Daspletosaurus a more likely ancestor of Tyrannosaurus than is Tarbosaurus. This means the Asian tyrannosaurid has been returned to full generic status. These studies have also shown that there is a strong possibility that Shanshanosaurus is a juvenile Tarbosaurus, sinking that genus. What a rethink!
There is a possibility that T. bataar can be split further into T. bataar and T. efremovi.
I am also including Maleevosaurus novijilovi under T. bataar. This is against Carpenter (1992) and I am doing so based on Carr (1998).
To view a picture of two T. bataars at their Home in Moscow (from the UCMP site at Berkeley), click ME. (It takes a while to load, so be patient)