I'm looking at our check/raise frequency when we defend the BB.

I ran two sims on a Q65 rainbow board - UTG vs my BB, and BTN vs my BB.

In both cases I gave the PRF only a small sizing.

So, on the BTN, he bets 86% of the time, and we check/raise around 15%, which was close to my guess.

Then I tried to guess how this would change vs UTG.

My guess was that his cbet % would go down, which it did, to 77%.

But I was sure that my check/raise % would go up, since my range has some two pairs that he never opens from UTG.

But in fact, our check/raise % drops to only 13%, despite us having some Q6s/Q5s which he can never have.

Obviously there are more factors in play than that, and his UTG range has a higher density of strong hands, but I'm still surprised that our check/raise % dropped in this scenario, am I thinking about this the wrong way?