please check this, this is where they talk about the new changes
https://www.chess.com/news/view/announcing-new-puzzles-rating-system
Give back to me 400 rating puzzles
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Oct 13, 2025
0
#3
now chess.com has adopted a new type of rating system
My puzzle rating was 3100 but after the change it is now 2000
I don't know why my puzzles score was decrease too much but not have the reason. It happened at 07/10/2025. So please give back to me soon