it depends. what is your rating?
What openings should I play for my tournament? The best will be the one I play the last three games.

I like to play the Italian game or maybe scotch game. French or caro kann against e4 and englund gambit against d4.

Or if they play Scandinavian the the icbm gambit is op but don’t forget to bring the queen back or it will be trapped
There are 6 games I have to play in. So for half of them, I have to play whatever openings you all want. Hope you guys choose good ones!