mine is... 
been using Tatics for 3 days and its been improving my chess, (online was 900, now with tatics (or other puzzles) it is 1260)
Tactic trainer
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If you known me any length of time, you'd know how quickly I've improved. Above is a picture of my chess.com rating graph.
How I did it was use the tactical trainer...ALOT! I highly encourage everyone to use it. You won't be disapointed