What should Black play? 2. ... axb4 3.Nf3

That is the worst gambit i have ever seen.

He/she shouldn't play it in the first place.

make your own mind up, plenty of choice.

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True, but I just looked at this gambit.

It's my favorite opening,not the one above,but The Polish(Sokolosky/Oran-utan),it has refreshed my chess playing,if anybody thinks that it's The worst gambit!Let us have a game and I'll show you different,go to the database and check out properly this opening,it also is very good to play it as Black aswell,the point is,tat very few people are aware of this surprising yet strong opening!

hummm....really.  My question is why would black ever play a5?

Try this,

Taking Out The Trash Part III (1.g4 Grobb's Opening, and 1.b4 The Orangutan).wmv (12,071 KB)

Hey its actually quite interesting opening play, it works well, although probably because nobody is used to this positioning.