Pipes All the Way Down

You are given 3 cards at a time which you can place on any open slot on the board.

Each card opens different slots around where it is placed.

The board is narrow, and placing cards near the edges is profitable!

Game ends when your score is negative (if you discard cards carelessly) or if there are no more open spaces on the board.

Yeah there are no pipes because I ran out of time to draw them.