That is true much hard for Zimbabwe to win this match any time it can lose wicket and this will be end of this match.
And that crash happened there and now after lost of 8th wicket it has no more chance for comeback because required run rate is over 10 now and this is really big pressure on Williams to keep him on strike as long as he can but Afghanistan has won this match from my point of view.
I think this match is still alive, Sean Williams has completed his maiden century and looking in great form, nothing is impossible for him right now as he is striking the ball very well. He can change the entire game if he manage to get two big overs. Afghanistan needs some excellent death overs bowling, singles will not hurt them but they need to stop fours and sixes.