double dominoA double-12 domino. A double is any tile with identical pips on both sides. Using a quarter or penny is a great way to mark an open train or station. Each player’s first move & opening private trainsThe double Chickenfoot is made at the beginning of each hand by playing 6 tiles diagonally, 3 on each side of the set tile. Chickenfoot are made throughout the hand by playing 3 tiles diagonally