I was confonted with a pretty rare double check raise line in today's session and I'm very interested in your take on it. MP played 21/17 over about 150 hands.

The Flop connects well enough with my 3-bet range while missing large parts of the middling cards that form a huge chunk of the coldcaller's range to range c-bet this board. Defending vs. the XR should be standard I guess.

On the turn MP check/shoves. In general, my approach is to avoid marginal situations and I tend to overfold these spots. However, I basically don't see how we can put MP on any value hand at all. His stats suggest that he has a somewhat reasonable RFI range, so he'll never have 33/22. I block QQ (one combination left, might have 4-bet pre) and taking this line makes no sense with AA/KK/JJ.

Basically the only hand with which this makes sense to me is flushdraws which try to exert maximum pressure. Thoughts?