What is the standardized format for Scrabble match annotations?
Ok, I found one example of an annotation method used.  The gcg format seems to be allowed on Cross-Tables.

This format consists of a number of lines which can be divided into 2 classes:


Events
Pragmata


The former are moves by players, passes, exchanges, challenges, and end of game events (penalties or bonuses for tiles remaining at the end of the game).  They start with the character &gt;

The latter are comments on the game, player names, the contents of player racks and a bunch of other options for future expansion or which have been made obsolete.  They start with the character #

The development of .gcg can be traced back to John Chew in August 2000.  I am not aware of its significance in the world of Scrabble nor of any competing annotation schemes which may be in place, particularly in Scrabble which is not TWL and especially for non-English Scrabble