# Why are my tactics ratings on chesstempo and puzzle rush different?

I just started chess.com puzzle rush today for the first time. My chesstempo blitz puzzle rating is 1567, but I can only get to 16-17 on puzzle rush, which is about 1000-1100. My mouse is bit slow, but still, shouldn't I be reaching 25-27? What am I doing wrong?

• Puzzle rush doesn't really correlate perfectly with blitz rating, you see players of varying playing strengths on the leaderboards. But 25-27 on the puzzle rush seems extremely optimistic for a player below 1600 (I have no idea what method you've been using to determine that 16-17 corresponds to 1000-1100, but that method seems very fishy to me). For reference, I'm a player at ~2200 Elo and I can't really do much better than 30. Commented Jul 22, 2020 at 17:06
• @RewanDemontay Maybe I should, normally I only comment if my answer is short enough and I don't need to work on it too much. It's more of a habit on my side than anything else. Commented Jul 22, 2020 at 20:24
• Those numbers measure two different things, so there's no reason why you should expect them to correlate. Commented Jul 23, 2020 at 6:58
• Well,what i wanted to say was the 17th puzzle in puzzle rush,most of the time is rated about 1000-1100.And my puzzle rating (blitz mode) in chesstempo is about 1570.The 28th puzzle has a average rating of 1500-1520.So why am i not able to reach 28 everytime? Commented Jul 23, 2020 at 10:40

After reading the comments, now I understand the question. The answer is simple: time. On ChessTempo you don't have a time limit, while on Puzzle Rush you have to answer within a few seconds if you want to make it to problem #25 or above. You also get a 1500 ChessTempo rating by getting right a certain amount of problems at that level (if you get them every single time your rating will go above that), but on Puzzle Rush you can only fail twice, so you'll need an effectiveness bigger than 90%... while answering within a few seconds!!!

There's also the difference in rating systems (each site could assign different ratings to problems of similar difficulty), so, as I wrote in the comments, if two numbers mean different things, you shouldn't expect them to match, despite looking related in appearence

i'm 3500 in chess.com puzzles, 54 in puzzle rush and only 2100-2150 in chesstempo blitz, which really is odd, many puzzles i've seen on chesstempo seems literally impossible to solve in blitz before you get negative score for the right answer, as shown by the frequent deep engine analysis comments. i believe that chesstempo rating scale exponentially starting at 1900, and in chess.com puzzles, you can feel the puzzles getting clearly harder at a decent pace over 2400-2600, but it is not wise to compare the ratings before that point.

@David already addressed the time issue in the accepted answer. This answer addresses the fact these are two separate rating systems.

There is no direct mathematical relationship between a x level Chesstempo puzzle and a x level Chess.com puzzle. We would expect player ratings on each site (puzzles, playing, etc) to be correlated. We can make models (1, 2) to describe the observed difference between these ratings, but they are not directly related.

Chess.com puzzle ratings do not correspond to player chess ratings, even to player Chess.com ratings. Sure, they are correlated, but these are two separately implemented rating systems. The relative values will be correlated but a 1500-level puzzle does not have a directly relationship with a 1500-rated player's skill on Chess.com.

Just as Lichess and Chess.com ratings do not directly relate (a 1000 on one is not the same 1000 on the other), the same is true trying to compare with Chesstempo. As an example, we might expect a 1500 Chess.com puzzle rating to have a Lichess puzzle rating in the range of 1555–1903 (1).

Tactics skills are beyond just mouse skills; one must drill pattern recognition, calculation, and learn new patterns.

Chess is a game we all love. The most important thing is to have fun!