Are there any study groups where people practise constructing practical implementable ranges, in the style of Jonathan Little/pokercoaching.com's homework assignments (e.g.
https://www.youtube.com/watch?v=Zwl_1v57Ax8), and then comparing them with solvers? (apart from the pokercoaching.com study group itself of course)
Secondly, as someone who hasn't bought a solver yet, I was wondering if any of the solvers out there enable you to do something like construct your own range for each street, and then the solver calculates and lets you know how much EV your strategy loses compared to its GTO approximation?