50NL 100 BB Deep no have something specific on villan but seems to be regish.

Hero is on the BB with QcTd

CO bets 2.5 BB and Hero (BB) calls.

Flop: 5.5BB Js 9c 5c
Hero check, CO raises to 3.2BB, Hero calls 3.2BB

Turn: 12.9BB 4c
Hero check, CO check

River: 12.9BB Ah
Hero check, CO raises to 6.4BB, hero raises to 27BB

1. OTF I decided just to call. what you thinking about xr here ? we hit this board hard but probably have just 55 and J9 as strong hands. villan cbet polarize this flop then I think its better to have very narrow xr range here.
2. which strategy is good to play on the river. The A hit villan and he probably going to bet thinly on this card. hence, we have to xr flushs as well.
   we block the flash but not two pair or set. I think Xc9x is better hand to bluff but not having SDV here to call with this and. what hands we probe for value and bluff what we check raise ?