Hi,

So far, I thought the best bluffs on the river would be cards like AK or KT.
The reason was that we were blocking the opponent's calling range. But now I realized that we are also blocking the opponent's folding range.

Is it okay to block the folding range as well? Or are these combinations inappropriate for bluffing?
Which combinations would you choose and WHY?

SB: $3.92 (15.7 bb)
BB: $25 (100 bb)
MP: $39.21 (156.8 bb)
Hero (CO): $25 (100 bb)
BTN: $25 (100 bb)

Preflop: Hero is CO with Xx Xx
MP folds, Hero raises to $0.62, BTN calls $0.62, 2 folds

Flop: ($1.69) Q 5 J (2 players)
Hero bets $1.12, BTN calls $1.12

Turn: ($3.93) 3 (2 players)
Hero bets $2.50, BTN calls $2.50

River: ($8.93) 7 (2 players)
Hero bets $5.90

Thanks!

When thinking about blockers and how they block or unblock a players range you have to think about what hands and opponent is likely to have played the way he did up to the point of decision. Blockers can matter a lot if it is likely you opponent could realistically have a certain hand or not have it.

For instance in your example above where you raise preflop and bet the flop. When we get to the river and look at the best hand it would be 46. Bluffing with 44 or 66 would be logical from the perspective of it blocking the nuts. However the straight is extremely unlikely as even if opponent called with 46 preflop. Very few opponents will call the flop bet with the backdoor draw (although some will).
On the board you gave what hands are opponent most likely to call up to the river with top pairs, good second pairs and Straight draws and flush draws. Depending on how loose your opponent is and what is range here drives your decisions. I’ll assume a standard button flatting range where villain can have AX flush draws me some broadway flush draws and smaller flush draws. IlL discard GSSD after the turn bet. That leaves hands like KTs, T9s. Let’s give him AQo, KQ, and AJ, KJ, QTs as stronger made hands that didn’t raise.

I think hands with the A or K or diamonds would be the worst hands to bluff with as those block a large percentage of likely flush draw holdings like AdTd Ad9d, Kd9d etc.
The next worst would be hands that block the straight draw which are hands that contain K and T. This board is tricky since the straight draw coincides with blockers that block likely stronger hands as well.
Also, I’m not sure how you are playing certain hands here. Hands I reach the river with are Ac2c, Ac3c, Ac4c, 7c6c, 8c6c. I like to add backdoor straight with a backdoor blush draws to my flop cbet range. Since all of these picked up equity on the turn I would continue to bet them. On the river, even though a couple of them have improved to pairs, they are less likely to win at showdown. They unblock opponents folding range and the AX block hands like AQ, and AJ.

I’m interested to hear from others in this as I am just now starting to wrap my head around this in study and am finding it harder to think about and implement in play.

You probably shouldn't have many triple-barrels for value OOP in that spot, so you shouldn't be bluffing all that much either. Hands that would make sense would be stuff like A4cc/A2cc, T9s, T8s, maybe 76s. KTs/K9s (not diamonds) might be OK too. Your best ace highs are probably "too good" to barrel every street, since they have some marginal SDV.
I think the post above mine has some good ideas (e.g. don't bluff with Ad).
What the solvers suggest might be quite different though. (I check the flop so often that I'm struggling to think of many combos that triple-barrel on that runout).

yes, you'd rather not have the cards you want v to fold
but sometimes you won't be able to come up with enough bluffs so you will have to pick some worse hands to bluff. KT is a better hand to bluff than AK because of the inferior sdv when river goes x/x

I think the solver would choose 5x hands to barrel w/ (A5s, K5s w/o diamond) depending on the frequency that V is flatting JJ, QQ if at all. We have a decent nut advantage on this flop and most likely sets on this runout is 55. W/ the bricked FD/SD I think there is definitely some merit to triple barreling esp. If villain is unlikely to flat AQ & JQo pre and exploitatively depending on his vpip and 3b %. If he 3bets TP/2 PAIR Broadway type hands on this board then he has a higher frequency of draws on his range that got sticky OTT. You could even turn hands around the low straight like 67 into triple barrels. I could be off the mark I'm a scrub.

What do you mean there aren't many value combos to triple barrel?Seems a safe enough board to get 3 streets from the overpairs/JQ/sets/AQ maybe KQ,with the missed flush draw youll get a lot of calls from way worst hands

What worse hands than AQ are calling all three streets?

FWIW, I think QQ and JJ work better as checks on the flop, and the same likely goes for AA/KK.

I've been thinking about it for a long time and I think that my main problem is that I've been sticking to the concept of a blocker effect all this time, which is probably usable when we calldown. What do you think?