Yes, in fact a large number of really strong players left the Soviet Union and became titled players in Europe and the US in the early 1990s.
thank you very much
Morpy - Tal - Fischer - Kasparov
I have doubts about the soundness of the sacrifice. Larsen should have won had it not been blitz.
Attacking in blitz to make your opponent think, so you can think on his time is quite often is part of a sound sacrifice.
I'd go with Nezhmetdinov, in the matches he plays with Tal, he comes out on top. Another great tactician I think should be mentioned is Veselin Topalov :D