Rousseau Gambit

What is good and what is bad of this opening?

White should not take the gambit but instead defend the e-pawn, typicaly with d3, but either accept or decline this position is an advantage to white. If white does accept black plays e4. The gambit has become refuted and should not be played, as black gains little while destroying his own kingside in the process.

Yes, I already experienced that.

Whites best moves are 4.d4 or 4.d3

The gambit is venomous. Helps me win 95% of the time whether accepting or declining by the opponent. Just play it.

White should play 4. d4 and be almost winning on the spot. The idea of f5 is if 4. exf5, then 4... e5 5. Ng1 d5 6. Bb3 Bxf5 and White has one piece developed with no pawns developed and Black has two pieces developed, the full center, a center pawn for the flank pawn, the open f-file for the rook after they castle, and has severely limited White's development. Black essentially wins on the spot if White takes the gambit.

Eric Rosen made a video on this back when the Stanford was really popular by he calls it the Lucchini Gambit. There are quite a few ways to go wrong but after a quick look at it, it shouldn’t be too bad to face 

I use the Rousseau Gambit myself, and while I'm not sure the correct way for white to play, here's what NOT to do:

Just go to Lichess and use the opening explorer. It’s how all those gambit videos come from. 

Just a quick note, before playing 5. d5, you want to prepare it by first playing Nf3, which stops Qh5+. If white can ever play it it's very bad for black.

No, Black can just play 6... Ke7 after 6. Qh5+ and be perfectly fine. Qh5+ isn't even the best move, as it limits the queen and it might become a target later on in the game.

According to the engine, it is about +0.8 for black. However, playing as white in this position feels very pleasant, especially if you sac the bishop by playing d3, going for Bg5+. The black king blocks the bishop's development, as well as the queen's diagonal development. e5 is always a threat, as well Nc3 then Nd5+. The only line winning for black is Nd4, which is very hard to find for your average unprepared blitz player.

The Lucchini Gambit can come out of the Rousseau Gambit. This is the Rousseau Gambit:

And THIS is the Lucchini Gambit:

And you can get the Lucchini Gambit from the Rousseau Gambit like this:

I appreciate the clarification. I guess it could also be called the Schliemann if you ask the right person

d3 and d4 both work after 3.f5 but i recommend d45

d5*

i mean d4