Question re: Tactics Trainer here

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SwissArmyTenor

I've been using the Tactics Trainer here for a few days now, and I like it very much.

I have a question about it.

It has been interesting to follow my progress (btw, this is not about the points, but more about the function), as I started by going on a much-varying but steady climb up over 100 rating points, then back down on a similar, varying but steady climb back down 100 points.  

Then, there was a virtually identical repeat - about the same amount, up and down.  

Currently, I have worked my way back up.

I have noticed that all during this, the rating given to problems I am solving has gone up, significantly.

So it has been interesting to have the same up and down pattern combined with an increase in the strength of the problems.  Sounds like a good thing!

But I'm fascinated by how the Trainer judges things, makes adjustments, grades points given on a difficulty/time spent solving ratio, etc...

I would be grateful to anyone who might write a few sentences about the Tactics Trainer's "teaching philosophy".  :)

Thanks in advance - 

SwissArmyTenor

Also interested to know your thoughts on how accurately you feel the Tactics Trainer gauges progression - or perhaps how many points you think you need to raise your proficiency to in order to actually say that there has been significant improvement.

I know that we're not talking about cold hard math = X results all the time.  I'm just idly curious in a general sense.