Rating has to reflect the chess strength of players. But berserk game is similar to game with leg-up, so when berserk is used, the calculation of rating changes should be changed or annuled at all. You may say it's a risk of the player who uses berserk, but I say that the player who uses berserk is not the only one who suffers. When he reduces his rating due to some berserk games, after that when he plays regular games, his opponents lose points because of his lower rating. And this is not fair.
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