You can easily make a sharp/tactical repertoire of sound openings. As black you can play the Najdorf and King's Indian Defense. As white - open sicilian, winawe

You can easily make a sharp/tactical repertoire of sound openings. As black you can play the Najdorf and King's Indian Defense. As white - open sicilian, winawer french, advance caro kann, be3/qd2/f3/o-o-o stuff against modern/pirc, bd3 bd2 o-o-o against scandi. e4e5 is the toughest nut to crack, but the evan's gambit is generally sound - Kasparov even beat Anand with it. Against the petroff you can play Nc3+o-o-o stuff. That should just about cover everything! But yeah, one thing you have to do to really start improving alot is to always assume your opponent will play the best move. Hope chess is how you ruin your own position!