Tactics trainer should select problems randomly from no less than 1000 problems.

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EndgameStudent
[COMMENT DELETED]
andyigreg

Sorry. I don't know how your post relates to the title of the thread. I believe there are around 48,000 tactics problems in total and that the problem with which you are presented is randomly selected from a pool of problems appropriate to your current rating.

EndgameStudent
[COMMENT DELETED]
andyigreg

I guess that at the very top (and bottom) end then the number of problems necessarily becomes limited. So the higher the rating you have, the smaller the pool of problems that can be given to you. I'd ask the people who wrote the algorithm. The definitive answer is in the code somewhere.

EndgameStudent
andyigreg wrote:

 I'd ask the people who wrote the algorithm. 

Good advice, I've deleted my posts and asked staff.