An interesting offbeat way to handle the King's Gambit Bishop's Gambit is with ...b5.  I see that there are 4 games in the database, and Black hasn't had the best results, but I think it might deserve a look.  What do you guys think?

The one time I played against this as white I beat it. It leaves the a1-h8 diagonal a bit to open for many tactics that can arise from sacing on f7 then coming with the queen check on f3 for instance, it also removes any option of castling queenside. I believe Kasparov played a clasical game as black with this opening and got frustrated when the judge forced him to play b5.

i dunno, this seems "instantly refutable"  by 4.Bxf7+!, where if kxf7 5. Qh5+ picks off at least the rook, as in ke7 6.Qe5+ kf7 7.Qd5+

Well, that is small minor change for initiative...if the queen wants the rook, fine, but Black can temporarily block the a8-h1 diagonal with Nc6, and he has two bishops that have the potential for open lines...I wouldn't necessarily say that sacking the exchange means a lost position...

Let's play around with the position for a bit and toy with some ideas, and see if we can find anything worthwhile for Black in case of Bxf7+ Kxf7 Qh5...

Here is an idea I propose to begin with for Black after Qh5...play g6! This way in case of Qd5, the king can run to g7 to get off the back rank and after Qxa8, Nc6 - if Nf3, then ...g5 preparing ...g4 with an invasion after the king.  Personally, White may be up in material, but Black has the initiative!

If you look through some older games, Paul Morphy, Adolf Andersen etc you will see this countergambit now and then.

There is one on the server with Andersen on the White side, but I didn't yet see a Morphy!  Maybe I can check out another chess website...

Okay, the site attributes 4...b5 as the Kieseritsky Gambit, but the practioneers seem to always play ...Qh4+ before ...b5.  This cuts out any funny business with Qh5+ for White. 

To me this is just one of those moves where black is dying to give back material for some reason. White gambited a pawn for central control and an open f file and thus attacking chances. Black gambits a pawn for one tempo?? Sure, it could reduce white's attacking chances by a small amount, but everything else white had compensation for he still does. Meanwhile f4 is still weak.

If you look at Morphy's career, this was one of his earlier choices...later, he chose other methods of handling the Bishop's Gambit.  But I think that if you want to have a less-known option to throw at a Bishop's Gambit player, I think this might be an idea.  Although I am not sure how much I like his style, playing Qd8-h4+-h6...not bad, but maybe I don't like all those early queen moves, really.