Which 12 holes were used in the DeChambeau Koepka match?

The 12 holes on the Wynn Golf Course in Las Vegas, in order of play, were 16, 3, 12, 13, 11, 5, 14, 9, 7, 8, 18, and (if they had made the final hole) the potentially driveable par 4 17th.

More about the DeChambeau Koepka match

The holes and the routing were decided collectively by representatives of the PGA Tour, Golf Operations at Wynn, and the people at Turner. It was primarily a TV event and this was key to the decision making.