# Can chess.com calculate percentages?

• #1

On my daily activity stats in tactics trainer I see the following message:

38/60 Correct (57% accuracy) over 35 Minutes
Mar 21st, 2013 - Apr 20th, 2013

Assuming that the accuracy is only dependent on solving the problem which I think is the only reasonable way of looking at it if accurarcy is going truly to be different from rating, then this should be a straightforward calculation of Accuracy (%) = 100*38/60 = 63% (2sf)

Yet chess.com claims the figure is 57%. Can chess.com do maths?

• #2
The_Hess wrote:

On my daily activity stats in tactics trainer I see the following message:

38/60 Correct (57% accuracy) over 35 Minutes
Mar 21st, 2013 - Apr 20th, 2013

Assuming that the accuracy is only dependent on solving the problem which I think is the only reasonable way of looking at it if accurarcy is going truly to be different from rating, then this should be a straightforward calculation of Accuracy (%) = 100*38/60 = 63% (2sf)

Yet chess.com claims the figure is 57%. Can chess.com do maths?

well i guess they go after correct moves and not correct puzzles.

• #3

Correct moves? Unless they are counting moves you don't get to play because you got the puzzle wrong, which would be pretty weird, then the move % would have to be greater than or equal to the correct % no?

• #4

@OP: Tactics Trainer takes the time spent into account. If I take very long on a TT problem and pass it, I can earn 20% on it. My stats for the day would then read, "1/1 Correct (20% accuracy)."

• #5

You do get some credit for getting the first moves correct but not finding the last move. Not much, mind you, but if it's a puzzle rated higher than you, you can still pick up points. I'm guessing that would be how you could get somewhere between 0 and 100% for a single problem.

• #6

OK so it is basically the same as whether or not your rating rises or falls? So what's the point of it?

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