Dear Chess.com Staff,

i really enjoy your site and have some suggestions to further improve the tactics trainer. I am missing the following options:

• Try all failed problems. So i defently don't get every problem right, after some time i would like to retry the failed problems to have a better learning effect. Implementation wise i think i would be enough to save the last 30 to 50 failed problems. More is of course better.
• There is an option performance. It allows you to see at which tactical problems you have the most trouble. I would suggest to improve this by adding an option to solve problems with the theme. For example: If a player sees in the performance view that he has trouble with x-ray attacks, he can click on a button to solve in this tactics session only problems tagged with x-ray attack tag.

So this are my two suggestions. I don't know how difficult it is to implement these changes and how much time you guys got on your hands to do this, so this is just some feedback from a chess.com user ;).