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"
Collins Scrabble Words would come to be known as OSW). North American Scrabble was using the "Official Scrabble Players Dictionary" (OSPD), hence when the first World Scrabble Championship took place in 1991 words from either word source were allowed. Over the following years there was disagreement in the competitive Scrabble community over the desirability of a combined word source, which came to be known as SOWPODS as an easily pronounced anagram of OSW and OSPD. Australia changed all its rated tournaments to using the SOWPODS word list in 1994, while the UK made the same change in 2001. This latter move coincided with