This is an opening gambit that usually arises from the classical Giuoco Piano position. There is not much literature/analysis/commentary about it available on the internet, so I call out to the Chess.com community. What do you think about this gambit? Is it even really a gambit since White seems to regain the lost pawn on d4 in a few moves? In my own amateur experience, this is a solid move order that ensures a decent position, at the least, and strong chances for sneaky tactics, at best.
The Deutz Gambit
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MelvinDoucet wrote:
I don't know why the white king is on g1. The same position with White having castled is a popular gambit.
sorry, that was a mistake. Clearly, the White King should be castled. I will update.
Wonderful Gambit !, I think This Gambit is Better than Evans Gambit.
Apr 7, 2017
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#4
It's a gambit and white doesn't regain the lost pawn in few moves after 5...Bxd4! 6. Nxd4 Nxd4. The only white's hope is that black makes an inaccuracy playing 5...exd4?! or 5...Nxd4?! 
This is a well known gambit, trying to transpose into Max Lange attack.
Max Lange attack :
"Deutz gambit" aims to transpose into after :
There is no simple refutation for black. If he wants to avoid tranposition into Max Lange attack (which is about equal but highly complicated), he/she can choose the line given by Yigor, with :
This line is called Max Lange gambit by John Emms in Dangerous Weapons 1.e4 e5, who made a superb work about Max Lange attack/gambit.
Indeed, it was first played by Lange himself.
We just call it Max Lange gambit to make a difference with Max Lange attack.
Maybe it is not as reliable as Max Lange attack, but it is not so bad and very tricky. Moreover, most players don't know it or just stops their knowledge when the opening begins...
The great author Mihail Marin tells that white has a strong initiative, 5...Bxd4 is risky, and black should avoid it and just transpose into Max Lange attack with 5...exd4.
Oct 10, 2018
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#7
My last post is about this gambit and all the lines that can arise from Bxd4, Nxd4 and exd4.
Also I'm currently playing it and it's great!
Feb 18, 2021
0
#8
I just published a page with this line, with a COTT (chess opening theory table) and pgn games. I first knew it as the Kolty Attack, after George Koltanowski who played it a lot in blindfold, and wrote a pamphlet on it. http://www.ozarkia.net/chess/theory/KoltyGambit/LangeGambit.html