So we know that in a 6max cash game at 100bbs, the GTO opening range from the LJ will open about a 17% frequency. Since we know this thanks to solvers, we also know that opening at 25% frequency is thus too wide and bad, and opening at 50+% is horribly bad.

However, how would you (using PIOsolver) go about comparing the EVs between said ranges, if possible?
I tried running a few sims only changing the ranges to see if I could calculate the EV difference by comparing the sims, but I believe there is a potential problem with this. Even though a range might be objectivity worse than other one, the flop can still hit the worse range harder and thus increase its EV in that sim even though said range is for sure inferior. For example, a standard opening range will crush an opening range of just 27o in terms of EV. However, on a flop that reads 227 the 27o range will be significantly ahead despite being the objectively worse opening range.

So, my question as stated in the title, how would you compare the EVs of two different opening ranges, if at all possible (Using PIOsolver). If there is a way to do so, please explain it to me in laymans terms and be specific if possible, im still learning how to effectively use PIOs preflop solver

Thanks in advance!

You need a multiway solver. The reason opening 25% of range from UTG is bad is because there's too many players in front of you and you won't be able to defend against raises correctly. You can't represent that effect in a HU solver.

Now if you want to compare ranges for a specific spot, let's say UTG open BB call, then you can use a flop subset. That is to say, you have it simulate a series of carefully chosen flops and aggregate the data.

Here's some more info on flop subsets: https://www.piosolver.com/blogs/news...the-whole-game

And here's a video explaining how to do it:
https://www.youtube.com/watch?v=LX8n2E3OGok

Thanks, this was helpful. Lets say however instead an UTG range I wanted to compare the EVs of two SB opening ranges. I could certainly do that in PIO, right? Since its effectively heads up at that point?

You can solve fixed ranges (i.e. SB opens BB calls) over a large subset of flops, then use pio's aggregate reporting tool to get the individual EV of all hands over that subset.

That tells you how your range performs against BB's calling range. But it doesn't account for the times you steal the pot pre, and it doesn't account for when they 3bet. You have to manually factor in this stuff to get the big picture.

Something you'll discover in this process is that the value of a hand depends on the strength of the range as a whole. The EV of every hand will change if you tighter or widen either player's range. So you usually need to iterate this process several times to find a good solution.

The other solution is to upgrade to Pio Edge, rent a supercomputer, and use a preflop solver.