Volodymyr
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Based on the rating formula, if the difference between players is 400 points or more, the favorite's win probability should be close to 100%. If the difference is less than 400 points, say 100, but one player loses 10 games in a row to the other without any wins, that means either one player's rating is inflated or the other's is deflated. The HeroesWorld rating formula is copied from chess, where they have been calculating using this same formula for several decades.
Nothing personal, purely as an example, if Maretti plays 10+ games in a row against Gomunguls, there is a chance that he will drop out of the top 5, but the probability of this event is close to zero. So we have what we have :) Some are in the top 3, while others are outside the top 20, the only question is whether the skill difference is really that significant?