The name of this games "seven" in Czech. It is a version of the children's game One-Armed Pete [also known as One Arm Joe] which is related to the Chinese domino game Tsair Deng (slanted nails).
The game uses a double six domino set and four players.
Each player gets a hand of seven tiles. There is no boneyard.
The lead rotates around the table each round, with the leader of the first round being picked by chance.
The player who is offered the lead must set a double; if this player has no double, then the lead passed to the left until one player can set a double. After that, the other players in turn build a train from one and only one side of the lead double. This initial tile is played crosswise to mark it as the start of the train.
If a player has a tile that matches the open end of the train, he can place it in the usual manner. If the player has no matching tile, he passes his turn to the next player. The following doubles are not played crosswise on the train.
The game ends when it is blocked or when one player dominoes. When a player sets a double he scores one point for his double and then one point for all doubles already in the train which are lower than his double.
The order of the doubles is [0-0], [1-1], [2-2], [3-3], [4-4], [5-5], [6-6], [0-0]. That is the double blank is both high and low. For example, the highest score is 7 points, when the doubles are played in numeric order, or when the double blank is played after [1-1] thru [6-6] are in the train in numeric order.
For example:
A game is 60 points.