I've for some time been trying to invent my own opening, but it's hard to find something that is new. I don't want to find a 'novelty' on move 26 in the sicilian najdorf or something like that. Eventually I came up with an opening variation:
1. e4 d5 2.
e5 Amazingly enough, this move is almost never played. Of course most people will think that it's just a bad move: "Can't black play Bf5 and after 3. d4 e6 it is a French with black's white-squared bishop already developed. That can't be good!" That why I came up with this variation: 1. e4 d5 2. e5 Bf5 3.
g4! Bg6 4.
e6. My main line runs: fxe6 5. Nf3 Qd6 6. d4 and white has got pretty good compensation for the pawn. I've been able to beat a 2000+ player with this opening in a 20 min. game. I really got crazy positions in which my opponent was 2 pawns ahead, but he had an isolated pawn, double pawn and triple pawn and his black-squared bishop was still not well developed.
The only problem was, that there were a few variations which completely refuted my opening idea

After 1. e4 d5 2. e5 Bf5 3. g4 Bd7, black is threatening h5 and can obtain a nice version of the French. Also, 1. e4 d5 2. e5 Bf5 3. g4 Bg6 4. e6 Qd6 was a very bad position for me. After 5. exf7+ Bxf7 Black's position in far superior. But luckily, almost no-one finds those moves when he is for the first time confronted with this move.
After that, I started to look for the same idea in other openings, and I found it! In the caro-kann, after the moves 1. e4 c6 2. d4 d5 3. e5 Bf5 I yet again tried: 4 g4! Bg6 5. e6. Compared to the same thing in the scandinavian, I made the move d4 and he made the move c6, I thought that couldn't be too bad for me. Fritz doesn't agree with me that White is clearly better (I'm a bit of an optimist) but still the opening is very fun to play and the surprise value is high.
The last thing I tried was again in the Caro-Kann, with somewhat the same idea: 1. e4 c6 2. Ne2 d5 3. e5 Bf5 4.
Nd4 Bg6 5.
e6. My main line continues: fxe6 6. Nxe6 Qd6 7. Nxf8 Kxf8. Black his an extra central pawn, but White has the bishops pair, and he can still castle.
What do you guys thing of these openings?