Global rules
The first version of WESPA's rules for global Scrabble was released in August 2009 after a six-month worldwide consultation process. It has since been used extensively in international tournaments, including the World Scrabble Championship and the Causeway Challenge.

The Rules Committee released a second version of the rules in November 2010, after working on it for nearly a year. It is shorter and tighter, and contains a number of key changes. Read a summary of the changes.

Version 3 of the rules has been released as of 13th October 2015. You can view the entire rules here and the summary of the changes since the second version here.

Global word source
The word source used in global Scrabble, known as Collins Scrabble Words or CSW (formerly Official Scrabble Words or OSW) is actually not a single dictionary, but an amalgam of three: Collins, Chambers and TWL, the current Northern American wordlist.

TWL (Tournament Word List) is itself drawn from a range of sources, mostly different editions of Webster's. Americans and Canadians play by CSW rules in international tournaments and TWL in 'domestic' North American tournaments. But they are increasingly introducing CSW grades in various tournaments, and even some solely CSW tournaments. WESPA hopes this North American isolationism will end one day, for the good of global Scrabble.

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