Tactic Trainer Rating Question

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OvenMitt

On Tactics Trainer on the problem rating there is often a + or - some number, usually btw 11 and 20 in parenthenses. What does this number stand for? Thanks in advance. 

Problem Rating 946 (+19)
IAS38

The problem was rated at 946
You gained 19 rating points for attempting the problem.

*It's possible to lose rating points, if the problem is solved too slow compared to your peers with a similar 'tactics trainer rating'.
*The purpose of tactics trainer is not to punish you for taking your time, or encouraging you to take risks (though it can feel like that), it is to provide you with problems geared to your level of play so that you can grow faster. 

mike_tal

Daydreaming of being a paying member and being able to do as many puzzles as I want.

Repletion

to mike_tal: try chesstempo.com

Ben_Dubuque

can I filter tactics, I always seem to mess up winning material, but if it involves attacking a king I almost never fail. whats wrong with me.