NL100 R sizing

It seems like he could be putting you on TX and is afraid of value betting the River. KQ should definitely be a bet though as you would have plenty of weaker QX, JJ/99 and maybe some Ace highs or small pairs.

You might want to think about what you are repping. Would TX really bet half pot or less? TX would be targeting QX and go for max value. If you took a bet size which made no sense, a better player might just check-call AJ high here.

There could be plenty of arguments for making very small or very large bet sizes. It really depends. Small sizes allow you to bluff cheaply against bad opponents who don't think too much.

idea: If he should bet KQ OTR what hands is he XCing OTR? It is closely connected with his betting range. I have a few questions:

Should BB stab any Tx OTT? (I think not)
Also he wants to check some Qx hands OTT to not let me valuebet all my Qx,ATo,JJ hands with close to 100% EQ, so he is betting like..QT and KQ OTT (is it OK or you would add more Qx?).
All in all, if he is betting with these hands on the river his best hand in Stab T, check R range is AJ. Do I want to bet big against this range?

Your 2.5BB PF should widen his calling range here significantly. Wouldn't be surprised to see him flat as wide as Q7s. I think there's a good chance that he checks some of his weaker QX hands.

With TX you have 2 options
-Bet large to maximize value against QX
-Bet small to keep his c/c range wide. He may have some Ace highs and low pairs which may somehow choose to lead Turn and herocall River. I'm not sure how often he would take such a line on the Turn with such hands.

Should BB stab any TX on the Turn? Sure why not? I think he has an easy value bet with KT and AT if you almost always bet QX on the Flop. He only loses to JJ and QQ if he has AT and you have some worse TX, and plenty of Ace highs and weaker pocket pairs which may call the Turn.

Your 2.5BB PF should widen his calling range here significantly. Wouldn't be surprised to see him flat as wide as Q7s.

Are you trying to say that if CO opens 2.5x with 30% opening range I should defend by calling w Q7s? If I understand you correctly. That's good news, because I was 3betting this hand.

I think he has an easy value bet with KT and AT if you almost always bet QX on the Flop.

If I don't? Best Qx I'm checkin here is QJ.