One Hand, Forty-Four Rivers

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One Hand, Forty-Four Rivers

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Phil Galfond

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One Hand, Forty-Four Rivers

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Phil Galfond

POSTED Nov 17, 2014

Phil recounts a live play hand from the summer and breaks down his turn decision by analyzing every possible river card and their effects on his EV.

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luestig 10 years, 4 months ago

So much love for this video, Phil !
Was looking at a similar spot where I didn't know if shoving or calling was better and was wondering how to analyze that <3
How many hours would you say did it take you to do this analysis?

Phil Galfond 10 years, 4 months ago

Thanks man!

The analysis took maybe 10 hours, but if I were doing it for myself rather than a video I'd assume I'd have cut it down to 2-3 (and it may have been 10% more rough of a #).

hakunamatata 10 years, 4 months ago

1 Could you give us a grasp of how much of thoughts you did during this decision live?
2 How would your thoughts process look now after making this video?

Phil Galfond 10 years, 4 months ago

My thoughts while playing live could be summed up as, "I think I'm pushing a small equity edge, but I also think that I gain playability on rivers due to the fact that my perceived calling range is made up almost entirely of draws with SD value of Tx or worse.

I don't think my thoughts will change much if I'm faced with the same situation exactly, but I'm now more curious to find more calling situations that I previously didn't consider.

Lefthook 10 years, 4 months ago

Fantastic vid, Phil!
Very impressive work, man.

I have a few questions for anybody who wants to contribute:

  • Phil's analysis clearly shows, given his reasonable assumptions, that he is better off calling turn then jamming. But doesn't this also assume that he will play perfect on every river? Phil showed a breakdown of each river to show we have good visibility with our equity distribution, but even still, we will make mistakes that impact our EV. I understand the value from this video is in the method and not necessarily the result, but I feel like this is important for practical application.
    Is it possible to quantify with any accuracy the margin for error Phil is allowed to have that would still justify calling turn?

  • Also, is there merit to potting flop for an effective jam given legend's stack? A quick sim from OO using a 6% range (high-card equity), shows we have ~62% with our specfic hand so there is equity to push here. At 3.5 spr after villain cbet, villain call/jam range needs about 44% equity against our range. I approximate villain call range to be: 82+, (AA:97+), (AA:hh), (KK:97+), (KK:hh), (J9+:hh). If this is acceptable, villains calls half the time at 50.58% and Phil nets $6,171. Which seems decently close to ev call($6,806), especially if you account for margin for error.

Phil Galfond 10 years, 4 months ago

Thanks LH!

I'd like to leave the question open to others for the time being. I'm curious to hear if people believe some of my assumptions were too biased.

Lefthook 10 years, 4 months ago

I think your assumptions will be inherently biased, but not so much as to contradict your conclusion or the makeup of your model, which is most important. I think this is what Sauce is saying in his beastmode manner.

All in all, very valuable content.

Arnaud Lafaurie 10 years, 4 months ago

just a comment on the format as it is too high elite content for me and it is not my variant of game. this is the kind of video that I consider as a real training stuff and a high value because it forces us to work on the topic. Some hard work has been put into it in order to make a high valuable learning material.
Hope, this kind of stuff will be available for MTT as I feel, this variant is not so much deep investigate especially recently. a lot of session review, HH review, live session are thrown as training material and not so much deep fundamental stuff with deep investigation on examples. I'd like from MTT coach a deeper work instead of making review that don't need too much work on. I don't say that it is not great content, it is most of the time, but it could be balanced with deep stuff, topics, that need investigation from the coach instead of just making a review.

midori 10 years, 4 months ago

Inb4 someone makes a video named "One hand, 990 Runouts"..

As always, a very nice vid Phil! Will watch it to the end by tonight and throw in some questions :O

Ph33roX 10 years, 4 months ago

Total ripoff of freeman's title. Immediate compensation required to prevent legal action imo.

Title aside, this is one of your best videos ever. It's easy to tell from watching the video what a hustle it was to make it. But it was extremely educating, not just because of the strategic value but also as a demonstration of what's possible to achieve with in-depth analysis.

As for the hand itself, I think the reason so many people view shoving as standard is because shoving is a lot easier. Calling with this type of hand on the turn just feels very messy intuitively because there are so few rivers where you are fistpumping to get the money in. It's very tempting to choose the emotionally rewarding (and profitable) play of getting your money in as a favorite against his range, but it's that Galfond mentality that says "rivers are tough for him too" and "we'll figure it out when we get there". This is one of the most valuable things I've learnt from watching your videos and this particular video is just a beautiful representation of that philosophy.

Thanks for taking the time to make this video, if your goal was to add value to your members then your time was well spent.

Phil Galfond 10 years, 4 months ago

Thank you very much for the kind and meaningful feedback, ph33roX.

It's funny - I make so many videos that sometimes I forget what I've talked about a lot and what I haven't. It makes me happy to hear that you've gotten the concept which inspired this video from my past videos as well.

Sauce123 10 years, 4 months ago

Hey Phil,

Excellent video!

I have you on around 51% equity on the turn vs a range that reflects the same assumptions you make about villain (but not using PJ), so it looks like your PJ calc is probably robust.

Your result is a ~6% EV spread between jamming turn (52% of pot) and calling turn (58% of pot), this seems extremely ambitious to me at first glance because you only have one small bet left in play to leverage on the river. Villain has to be playing exceptionally badly for you to realize that large of an advantage from that small of a bet, especially since your hand only rivers polarized versus villain's range on the 8/2/7 offsuit for value and on the 4h as a bluff/fold (you have ~4.5% here by my calc). You're between 14% and 34% equity on most of your other bad rivers, mostly hearts and Tx. Luckily, on your worst rivers, your range often improves, and on your best rivers your range gets weaker, so you'll likely way outperform what a toy game model of his range vs your exact hand would suggest. Even so, I think if villain plays well he should be cutting the advantage of your turn call from ~6% to ~2% or thereabouts.

The reason your calling advantage is so big in your calculation is that it seems like villain was playing poorly on almost every river, but some of the most obvious examples were ones like Jo-Qo, the Ko and the Ao. On the Jo/Qo you fold to a jam but value jam yourself, I think it's intuitive that this shouldn't happen if he's playing well. On all the rivers you define his value/bluff regions with reference to your range, not your hand, (which is correct, but I just mean that he doesn't need to beat 82 to shove) and given this methodology he should show up with relatively balanced ranges when he bets. Instead, on the Ko he has a ratio of 44:4 value:bluff and on the Ao he has 59:3 value:bluff and you again jam your hand for value against his checking region even though you're only 24% against his jamming region.

I'm certainly not disputing your reads (and I definitely can see a player like the one you described playing like this), but I just thought it's important to note that the lion's share of your play's EV comes from villain's poor play. However, I'm pretty sure calling will still win you an extra 1-3% of the pot even if the river play is good on both sides, and the reasons why this is the case are very similar to the ones you showed in the video. It's just that the magnitude of the improvement should be a lot smaller if villain bluffs with better frequencies, uses his blockers more efficiently, and check/calls a stronger range.

Phil Galfond 10 years, 4 months ago

Thanks Ben,

I need to think a little more about how I feel about this:

I'm certainly not disputing your reads (and I definitely can see a player like the one you described playing like this), I just thought it's important to note that the lion's share of your play's EV comes from villain's poor play.

Thank you for including the first part, as I do believe that the villain (and many other villains) will play in a way I described here. As you know, I take an exploitative approach to the game and I think there's a lot of value in passing some exploitative strategies on to our members.

I feel intuitively that I gain most of my edge here due to the makeup of my range (and position should be worth a little bit, even with stacks this shallow).

I'm in the middle of packing for a trip out of town, so I'll think this over and figure out if I'm able to argue with you :)

jonna102 10 years, 4 months ago

I'm certainly not disputing your reads (and I definitely can see a player like the one you described playing like this), but I just thought it's important to note that the lion's share of your play's EV comes from villain's poor play.

In theory, this is always the case though. If everyone always plays well, the only winner is the house. I think the key benefit to doing an analysis like this is that it gives an opportunity to think through most of the possibilities in a structured manner. The actual numbers (the "solution") matter to some extent, but they will always be subject to the assumptions made (and there are many).

Thinking through a hand like this, it can help discover some lines that the opponent is more or less likely to play poorly against. But also to consider whether hero would be more or less likely to make mistakes on certain cards/actions/lines. And then also consider sensitivity analysis, how much do the conclusions change if my assumptions are wrong?

I think all of that comes out of this process, and the key thing is the process, not so much the actual results.

Apoth 10 years, 4 months ago

I can't even buy leafs tickets for 100 bucks... but I can watch this. What a crazy world we live in.

(I will admit using the Toronto Maple leafs as a measuring stick for value may not be ideal but hey...)

Apoth 10 years, 4 months ago

Not a basketball guy myself. Just drive to buffalo and catch Bills games instead . Best value there is imo. 150 bucks for first row at the 40 yard line behind the visiting team's bench. Compare that to a mortgage and a kidney for upper bowl leafs tickets.

R0b5ter 10 years, 4 months ago

I really liked this video. Very impressive that you put so much time behind the theory work before making the video. It really shows in the quality of the product.

Chase Steely 10 years, 4 months ago

Great video! I'll be honest the 1.5x speed feature was the absolute best suggestion for this video. Easy to rewind also if something is missed.

oboltys88 10 years, 3 months ago

Whats the measure of inaccuracy of those river EV calcls? And how do you guess villain's river strategy like that? I think you should try and do a second iteration i.e. fix your own strategy and come up with the best counter strategy for villain. After at least 3-4 iterations you can come up with the river EV.

Nhat 3 years, 5 months ago

Hey Phil its a really great educational video,
I learned a lot about how to think about poker. Its a really great process you walk us through thanks for the time you dedicated for this video and in general for the pokerworld, I really appreciate your work, I wish you the best.

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