All Threes Domino

Start by picking 7 domino tiles each for a two-player game. Put the first tile on the board to begin the domino chain. Take turns placing tiles to either end of the chain, checking that the corresponding numbers meet. Gain points by creating multiples of 3 at the ends of the chain. Calculate your score by totaling the numbers on the ends of the domino chain after each move. Proceed playing until one player exhausts of tiles or no more moves are possible. Whoever with the highest score at the end wins.