I invented a gambit against the vienna game
After
e4 : e5
Nc3 : you play the pawn sacrifise f5.
Stockfish says it's +1.7 for white but white has to overextend their pawns and play in a very sharp way and even a slight inaccuracy can make it a win for black but if the opponent knows what he is doing, then he can put black in a passive position but still have some weaknesses.
Check out this game featuring the new gambit in which i played
Btw i call this the Schnitzel gambit
https://www.chess.com/analysis/game/live/83505358481?tab=review
And here are some master level games
https://www.chess.com/analysis/game/master/16317013?tab=review
https://www.chess.com/analysis/game/master/16146499?tab=review
https://www.chess.com/analysis/game/master/14036229?tab=review
https://www.chess.com/analysis/game/master/15479549?tab=review
https://www.chess.com/analysis/game/master/14994307?tab=review
https://www.chess.com/analysis/game/master/15124727?tab=review
https://www.chess.com/analysis/game/master/15041725?tab=review
https://www.chess.com/analysis/game/master/11529?tab=review
https://www.chess.com/analysis/game/master/15782139?tab=review
https://www.chess.com/analysis/game/master/15747493?tab=review
That's all of the master games which include the schnitzel gambit in all of history - ONLY THESE!!!