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  • eanderson85

    September 7, 2023 at 11:00 pm

    Geometric bet sizing is a betting strategy in poker in which the bet size is the same on each street, such that the effective stack is all-in on the river. This strategy is also called the “geometric bet size” or “geometric growth of the pot” (GGOP).

    The main advantage of geometric bet sizing is that it maximizes the amount of money your opponent puts into the pot and threatens your opponents’ stack with a simple betting strategy. If you know the geometric bet size to get all in by the river, you can adjust from this strategy to fit your opponent or situation. If you want a bigger river bet, just bet less than geometric.
    To simplify your equation, you can just bet 1/4 of the effective stack on the turn, and the all-in will be twice the size of the turn bet.
    I think of geometric bet sizing as similar to ranges. It is a base line that you can adjust to fit your opponent. The better your opponent, the more you want to stay consistent with your bet sizing as a percentage of the pot and have that jive with card run out. When opponents figure out you are using GGOP, they know they will be all in by the river, and tend to overfold on earlier streets, but when they do show down, they are strong.

    With range advantage we bet often, with nut advantage we bet large, and vice versa.

    When the flop comes QsJsTh, that is flop that gives the aggressor both the range advantage and the nut advantage, and we want to get the money in as smoothly as possible. That is the best time to use geometric bet sizing. A 40% pot bet all-in on the river when you have the nuts is a better value situation than a pot-sized bet.

    When the flop come 5s4s3d, the aggressor has neither the nut advantage nor the range advantage, so they should check most of the time, and when they do bet (with the nuts and draws to the nuts only) they should bet 1/4 pot or less. The plan on a flop like this is to get to showdown as cheaply as possible, because your opponent has all the straights and (if in the Big Blind) all the flushes in their range. Unless the SPR is very low on this flop, getting all-in by the river by betting this flop is a good way to value pown yourself. Of course, calling an all-in with the nuts is the most fun of all, so letting your opponent bluff is the strategy with value hands here.

    Do you think having a pot-sized bet on the river maximizes the EV of your nut hands?
    Or are you just trying to get them to fold to your bluffs?

    Per Michael Acevedo Table 90-91 page 321 of the Modern Theory of Poker: When stacks are deep, more streets are left to play and the better your opponent plays, the more range balance matters and the less raw equity matters. When stacks are short, all the money will usually go in pre flop or on the flop which makes raw equity the dominant factor. As stacks get deeper, play will occur across multiple streets which increases the need for constructing well balanced ranges.

    Constructing sound post flop betting strategies is not an easy task.
    Not only do you need to preserver your informational advantage on the flop, but across all future streets, too. Runout coverage is essential for both betting and checking ranges. If you don’t have the right runout coverage, even if your flop ranges are well constructed to make your opponent’s decision difficult on the flop, they could still exploit you on later streets.
    Poker is a game of equity, how much you have and how to effectively realize it. Betting helps realize equity because it denies your opponent’s equity and it also helps set up the SPR in a way that can be beneficial to your equity realization.

    Range composition is always key to determine optimal betting strategies.

    All the different actions you take convey information. Once you take an action, you can only hold hands that would be present in the range that takes that action.

    One of the biggest mistakes I see rookies make is trying to represent a hand that they clearly can never have given the way the action has played out. this is why it is important not only to be able to hand read your opponents correctly, but also to be aware of your own ranges and make sure to keep them well balanced.


    Also watch the book study on the Modern Theory of Poker, Session 13, 38:19 and my Quizlet on Chapter 10 of the book @ <b style=”font-family: inherit; font-size: inherit; color: var(–bb-body-text-color);”>eric_anderson517

    The best bet size is the one that takes your opponents to a branch of the game tree with which they are unfamiliar, leading them to make the greatest number of mistakes<b style=”font-family: inherit; font-size: inherit; color: var(–bb-body-text-color);”>