Originally posted by Restless Soul'Tis all psychological. First, it has that element of surprise (this is especially useful if the pairings are known ahead of time, rendering any preparation your opponent might have done for your game useless). Second, it puts the pressure onto your opponent to win and forces them to "do something".
Nope..the 'hammer' is still bad...this is one opening that I can touch. While it's not a direct forced win for black, I can't imagine how people lose to this opening, unless they are playing someone a lot stronger then them.