Probing the Turn

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Probing the Turn

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Tyler Forrester

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Probing the Turn

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Tyler Forrester

POSTED Dec 15, 2020

Tyler Forrester boots up the replayer and loads hands where he probes the turn as the out of position caller.

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ItsPokaBruv 4 years, 3 months ago

Hi Tyler,
Good video, I like the use of hand historys and PIO to cover specific spots. On the first hand when you missed the bluff with QT, it raised a question I always have in my mind for river spots like this, how do I accurately assess how often to bluff with a hand or my range so I am not overbluffing or underbluff that node? Is there a way to figure it out? Or do you just need to make an assessment or the amount of value hands you have, compared to the amount of air, and your blockers to opponents calling and folding range, and then make a guess at how often you should bluff?

Tyler Forrester 4 years, 3 months ago

It’s always a function of value hands. The more value hands the more bluffs. In fact I chose 3/4 pot then I need 28% give or take (I want to overbluff tighter players and underbluff looser players) of my value range. The card removal issues are secondary concern when I have too many bluffing hands.

ctrlplay 4 years, 3 months ago

More of these types of videos please, Tyler! Those were some interesting spots, and it's great when you can bring up the sims so we have a visualization of your range and balance discussions.

Shaun Pauwels 4 years, 3 months ago

Very good video. Would you agree that if BTN cbets too often we can get away with way more probing?
It's an exploit I'm using right now at microstakes. Same with river followthrough.

Tyler Forrester 4 years, 3 months ago

So I c-bet 80% of time and fold to small turn probe 12% of the time and medium about 40%. Basically the exploit you should be looking for is someone who bets medium strength hands consistenly on the flop -- like second pair, 3rd pair and pocket pairs under the top card. If they do this, then basically they have to overfold to the probe, because they have no calling range.

RunItTw1ce 4 years, 3 months ago

Why is PIO mixing instead of just using some hands at 100% and others at 0%? For players who don't use RNG would this strategy work? For example the QT first hand on J967dd-5x. I know diamonds play a roll but looks like the ATo, KQo, KTo, QTo are all half combos so 24 combos total. Could you just pure check your ATo KQo and pure bet KTo and QTo? Would have to add up how many sets, 2 pairs, and 8x we have that are betting for balance. I just don't understand why ATo and KTo would be like 50% each when you can just bet KTo at 100% on the river because less sdv then and pure check ATo.

Also are ratios still
F 2:1 bluff to value
T 1:1
River 2:1 value to bluff right?

These ratios matter with PIO or more based on bet size with modern poker?

Tyler Forrester 4 years, 3 months ago

Here's where PIO deviates from traditional poker logic. The ratio creates a situation where if they have a hand worse than X, they've lost the pot whether they call or fold. This means that if they are in this region, they'll never make a mistake on the node (because the decision doesn't matter). However, we are guaranteed an extra percentage of the pot, when they are in this region. The math works out that we get an extra bluffing percentage of the pot. So if the ratio is 3:1 to value bluffs we are guaranteed an extra 25% of the pot, when they are in this bluff catching region (no matter they're decision).

In practice, if they always called, we could make an extra 50%* Value Region of the pot, by never bluffing and if they always folding we could make an extra 100% * Bluffing Region > 25% by always bluffing. So the number that PIO produces is a lower bound on our actual max profit. Because we want to maximize profit, we should pay attention to calling/folding ranges and their sizes.

The mixes you saw are related to calling values. Because poker is actually just a giant sum: ValueofCall(2c2d vs Player2Range) + ValueofCall(Player1Range vs QhTs) + ValueofCall(AdKd vs Playing2Range) + ... = ValueofCall(Player 1 vs Player2). If we happen to only bluffing certain regions due to card removal, then Value Calling of 2c2d could be less than 0 and Value of calling AdKd could be greater than 0. So for example our sum of bluffing-catchers could be -5 x .5 + 0 x .5 + 5 x .5 = 0, where .5 is our calling frequency. They key thing to realize is that I could improve my value by calling: -5 x 0 +0 x .5 + 5 x 1 = 5. That's clearly sub-optimal, because now I just change my strategy and I make more money. PIO can do this math down to the combo, so comes up with wickedly complicated bluffing strategy to prevent subtle exploitation in the sums.

In practice, I think the matchup level analysis should dominate your thinking -- with the understanding that you need to bluff to keep people from changing to always fold strategies.

RunItTw1ce 4 years, 3 months ago

I ain't gonna lie you lost me on the math. The Solver is showing a bluffing region here and green is checking region. You mentioned calling region below, so not sure if we are on the same page or not.

I am still trying to balance my combos to 2 value : 1 bluff on the river per Janda's books. If the ATo/QTo is 12 combos, I still don't understand why we can't bluff all 6 combos of QTo and check all 6 combos of ATo. Frequency wise it is still balanced for that region with 6 bluffing combos, rather then 3 combos of each. I just prefer to bluff the less sdv hands and hopefully ones that don't block opponent's opponents folding range. I can see the issue with QT blocking opponents folding range on the J9675 board, but in my mind you just have to pull the trigger because blockers only count for like 10% of overall range anyways. I'll likely have to read your message 10x over to fully understand it and try and use your formula myself to fully grasp it. On the surface I understand, just not very clear even though it looks like you explained it clearly.

I'll read it over a few times and see if I can understand a little bit better by Monday.

Tyler Forrester 4 years, 3 months ago

I reread my post I wasn't very clear. Basically in the hand if I have Q9, you have 8 combos of bluffs so Q9 is always a fold on the river, so I can improve my expectation by just folding all hands with a Q. If I have A9 now, it's an easier call, because you are bluffing 4 extra combos. PIO takes this type of insight and runs many iterations until the range all hands are indifferent. Otherwise you can gain expectation by pure calling regions that don't block bluffs or alternatively you lose less money by folding QJ, because you face less bluffs, so we aren't indifferent anymore between calling and folding.

JoeAdams1 4 years, 2 months ago

this is how i understand it ,say villain has KJ and AJ as bluff catchers and there both 0ev, say the solver is bluffing AT and KT and 50% frequency say you start bluffing AT pure you become exploitable because KJ becomes a plus ev call and AJ becomes minus ev. So solver will now just call KJ and fold AJ and increase his ev because rather than having 2 0ev calls he has a winning call and a fold which is 0ev, so his strategy over the 2 hands now has ev rather than being 0ev.

RunItTw1ce 4 years, 3 months ago

29:15 also seems a bit strange with so many 2 pairs 93s 83s 63s betting small but quite a few 6x and 8x betting big. Also 9x being pretty mixed with different sizes and checks. Not sure why K9 Q9 J9 would choose smaller bet size over K8 Q8 J8... Doesn't make sense in terms of hand strength. I understand A8 wants to check more than J8 because A8 blocking some ace highs. Not sure why 54o\s also chooses mostly small size. I would wanna size up with all 2 pairs, straights and sets personally. Probably check a bunch of 3x and 6x but bet 75% size with 8x and 9x+ a long with hands like J5s J4s etc.

Sticking with video theme maybe probe 54s and pot size bet off suite? Probe T7s and psb T7o?

Thanks for feed back. Any help with a heuristic in these spots for non RNG player would be greatly appreciated.

Tyler Forrester 4 years, 3 months ago

The idea is and this is dictated heavily by the choice of betsizing in the sim, that I want to bet small and have a reraise range to hurt his slim value raises. I played a hand yesterday where my opponent raised the block on T976 with QQ. I really want to cut down the value of this sort of exploitation, so I need to bet 3-bet sometimes.

Jeff_ 4 years, 3 months ago

Okay, I've run few sims with multiple sizings(however solid 2,5x monker ranges) and can confirm that 632, 982 and last hands are most using 1/3 probe size. Other boards are pretty mixed with everything. However thats not reasons for writing

Fairly common mistake by low stake players is to underdefend vs those probe bets. So we can have nice exploits by really pressurring on the turn and on some good rivers (only good ones, since if they overfold turn(under raise) their river range is quite strong). Any other exploits you can mention?

Tyler Forrester 4 years, 3 months ago

Players are all over the place in this spot. Some people fold frequently, others basically rarely fold. Basically, I think the key to remember is that everybody plays this spot a little bit differently, so you need to adapt to the player here. GTO gives you some ideas about how to play solidly against an unknown, but the exploit level here is still reasonably high.

TurduckenTamer 4 years, 3 months ago

Appreciate the video. You mention a few times that you tend to over-defend your BB. I hope you don't mind me asking, but why do you choose to do that? I hesitate to say this because I don't wanna be "that guy", but I feel like many of these marginal spots could have been avoided by folding pre.

twooutricky 3 years, 6 months ago

at 26:30 - board is 63289 you have K6o, block probe turn, block barrel river, and you talk for a while about how close the pio model is to reality and make the assertion that IP defense is easier to construct than OOP block, and there's not necessarily a clear reason to think that having a block sizing here is producing EV in practice.

If you don't expect IP to make bluff catching errors facing the river block, would you be willing to assert that they'll under or over bluff raise facing block? or that they will underbluff or overbluff river when checked to? do either of these factors make a decisive difference in EV for K6 in either the block or X line?

I often hear arguments for block more bc villain won't raise enough for thin value or as a bluff.

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