You read that right, it isn't a typo. This topic is for all of us Beginnerds! ;)
First, you need a basic understanding of what Scrabble Beta bases their ratings upon. That would be the Elo Rating System. Arpad Elo created the system as a way to evenly match opponents in chess games. Extrapolations have been used for various other competitive games, including Scrabble.
Just because you win a game, doesn't mean your rating should or will increase. If you are playing a weaker opponent who does well against you, you may lose rating points even though you won the game. The expected outcome is for the stronger player to win. If the stronger player has a weaker showing, the player who loses may even get a couple points added to his/her rating while taking a loss. Even if you win 5 games and only lose one game, your score may still drop depending on the strength of your opponents.
What does this all mean? If you are obsessed with keeping your rating, like some players seem to be, play against players with a higher rating and don't worry about players with lower ratings than your own. Winning against players with a rating 100-200 points below your own will get you a W, but only add a point or two to your rating for the effort. Win a game against a player with a rating 100-200 points above your own, not only will you get a W, but you'll get more points added to your rating for he effort. The converse applies. Lose to a player with a higher rating, you won't lose much on your rating.
The classroom is now open for discussion! ;)
Like this post to subscribe to the topic.