Scrabble have been sold worldwide and roughly one-third of American and half of British homes have a Scrabble set. There are around 4,000 Scrabble clubs around the world. The game is played by two to four players on a square board with a 15×15 grid of cells (individually known as "squares"), each of which accommodates a single letter tile. In official club and tournament games, play is between two players or, occasionally, between two teams each of which collaborates on a single rack. The board is marked with "premium" squares, which multiply the number of points awarded: eight dark red "triple-word"
Scrabble Pocket Books, 2001) and the Scrabble FAQ. When available, separate records are listed based upon different official word lists: Two other records are believed to have been achieved under a British format known as the "high score rule", in which a player's tournament result is determined only by the player's own scores, and not by the differentials between that player's scores and the opponents'. Play in this system "encourages elaborate setups often independently mined by the two players", and is significantly different from the standard game in which defensive considerations play a major role. While the "high score" rule has