10.5 BBs in the pot with 3 players. Flop is K, 9, 2d. Hero bets the pot and pfr calls. Turn is a blank and checked. River is J. Hero bets the pot and raiser shoves for 200 BBs. What is the right move here vs Unknown? Or don't defend with KJ?

You bet into the preflop raiser on the flop?

Yes, I hit top pair.

It would be nice to know positions and preflop actions as well as stack sizes at the start of the hand.

In general if you weren't the aggressor on the previous street it's pretty standard to check to the agressor instead of betting into them for a variety of reasons.

Given the value range this person is representing and the way the hand played out I would assume KT/QJ/JT would be slightly better defends here for the straight removal effects. JT being especially good blocking JJ as well.

Overall KJ is probably high enough in your range where you might have to defend IF you think the player can bluff enough here. Hard telling without more information but given the odd turn check and then gross river overbet I would just fold and not be bothered too much by it.

Edit: Also your river bet is too big given the turn checks. You should be targeting weaker hands plus you won't be bluffing much after the turn checked through so a smaller sizing is likely better.

It was raised 3x by 3rd seat and called by the hijack and BB. Flop was a K and Hero bet with top pair and decent kicker. Turn was a blank, which Hero checked and villain checked. J on the river and villain re-raised all in. Stacks were 200 BBs. I admit my bet-sizing read skills are rather abysmal but I'm trying to improve.

Rofl

Why are you over-betting with tp ok kicker? And then again otr?!

the hh formatting is hard to follow