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I'm conducting an experiment where I'm using a static model post-flop and then solving a large HUNL preflop using CFRM. In most cases, the EQ seems to call 23o from the button (although it folds some other hands). I was wondering if anybody had seen this before?

What stacksize are you considering?

In my experience, I found that the charts can change drastically with even minor changes to post/preflop charts.

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Let's drop conventional languages and talk C++ finally.

Assuming your raising 23o 2.5x with a 3x 3B by the BB you would need 35% equity to call. 23o vs rather wide 12% 3B range is only 27% equity. So calling a raise here is out. The only thing good about this hand is that its disguised and both cards are likely good. 23s would be a much better candidate to call a raise here with although it only has 3% more equity but bigger implied odds.

If limping then you can assume he would raise you 25% of the time and check the rest. So 25% of the time you have to fold and 75% of the time you see a flop with only 33% average equity vs BB checking range. This is only 20% equity weighted for frequency. So limping is out.

So the only way you could play 23o is by raising if the BB over folds. Calling or limping HU is out for that hand entirely for just about all stack sizes. SPR 1 requires 25% equity so you cant even Jam unless you have virtually nothing left in your stack.

So yeah I don't know how your app can say its good to call here even on occasion.

I'm wondering what about the post-flop makes it do that. As it seems to improve the strategy vs. the original model.

Initially it does fold 23o, but then eventually converges to calling it (and AA).

Ok that could be. So lets assume you limp with 23o, villain checks and you see a flop. So lets make a broad assumption that he check folds any hand with < 33% equity. So using the above scenario that represents 57% of villains range and you would profit by c betting 100% of the time IP. So we would have to do some math here to figure out if the preflop disadvantage is overcome by the times we c bet the flop and villain folds when we have total air. 24% of the time hero flops enough equity to value bet (50%+) with 23o. I will think on this.