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[edit] Concentration

Concentration is a dominos game that is generally played by two players. The bones are placed face down on the table, shuffled by one, both, or all players and then arranged in a simple rectangular grid. For double-six dominoes, for example, the 28 bones would be placed in four rows of seven bones each.

The goal of play is to collect pairs of bones. The player who collects the most pairs wins the game. With double-six dominoes, pairs consist of any two bones whose pips sum to 12. For example, the 3-5 and the 0-4 form a pair. In some variations, doubles can only form pairs with other doubles so that the 2-2, for example, can only be paired with the 4-4.

Players, in turn, try to collect pairs by turning over and exposing the faces of two bones from the grid. If the four faces of the two bones sum to 12, the player takes the two bones, scores a point (in some rules a point for each bone taken), and plays again. If the tally is any other number, the bones are turned face down again and the player's turn is over.

The first player to accumulate 50 (or 100) points wins the series.