For a one-time fee, you can get the premium version, which removes all restrictions indefinitely. This means:

• Play as many deals per day as you want (otherwise, after you have played 100 deals you will be restricted to play only 3 deals per day).
• You will get your true rating (without the premium version, rating points above 1100 are reduced with 20%).

Essentially, the rating system is designed so that if your rating is 250 points higher than the average rating of all the players in the game (including you), then you are expected to score, on average, 1 point better (i.e. lower) than the average each round in a 2-player game. In a 3-player game, you are expected to score 1.135 points better on average, and in a 4-player game you are expected to score 1.205 points better. (This slight adjustment has to do with the fact that the spread in points grows with the number of players.

The rating is computed based on the 200 last played deals. You begin with a rating of 1100.

Sometimes it might seem you have played well, but the rating still decreases. Even if you win, the rating may decrease. There are a number of possible reasons for this:

• The rating is based on the difference between your score and the average. It also depends on the rating of the computer opponents. If you win, but you do not win by enough points (as many points as you "should" win by, according to your current rating), this would drag your rating down, rather than up.
• If you play against lower rated computer opponents, you have to win by more points to maintain the same rating (and the lower the computer rating, the more you have to win by).
• Only the 200 last played deals are included in the calculation. After that, every new deal you play means that one old deal is removed from the calculations. It could thus be the case that the old deal, which is removed, had a greater positive effect on your rating than the new one (even if the new deal also was good).

The rating can thus sometimes be reduced even when you have a good game; this does not mean that something is wrong/buggy.

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