Shultze-mueller-gambit

The Halloween Gambit (also known as the Müller–Schulze Gambit or Leipzig Gambit) is an aggressive chess opening gambit in which White sacrifices a knight early-on for a single pawn. The opening is an offshoot of the normally staid Four Knights Game and is defined by the moves:

1. e4 e5

2. Nf3 Nc6

3. Nc3 Nf6

4. Nxe5

this opening in bullet games is pretty strong for the unready opponent however in blitz games it's not recommended ...as inexperienced players will have trouble ...with the moves ahead..and will soon lose if not ready for the opposing attack...however this opening is unusual...and will suprise even the most experienced players...in bullet games and is worth the knowledge to learn it..

Seems a bit odd.

Even in slow and correspondance games Black should be very careful in order to counter this opening correctly. Game can quickly become dangerous.

Sacking a piece on the 4th move without anything tangible? You're really counting on your opponent screwing up, I wouldn't play it at high level.

At The Unsound Openers we play it in TMs and even in vote chess, against groups that have 2000+ rated players participating.

Here two of the TM games our guys won with White, both with players rated around 2000.

I met it once at correspondence chess (engine usage allowed) and I won as Black, but my feeling is that with best white play the most I could expect was a slight advantage, and nothing more than that.

http://www.chess.com/blog/pfren/a-halloween-bust

I think I do know where Black can improve, but ATM I'm too busy to analyse it properly.