When a BTN straddle is posted, the blinds act first, and even after opening they often end up OOP postflop. This article explains how to adjust 4bb opens, BB limps, and wider CO ranges by position.
UTG straddles usually play like a normal game with larger opening sizes. A BTN straddle, or Mississippi straddle, is different because it distorts the action order itself. The SB and BB must decide first, while the BTN has already posted 2bb and gets to defend last.
Because of this structure, the blinds have to enter the pot with very little information, and even when they open, they often allow the BTN to call in position. So the key in BTN straddle games is not to open bigger and apply pressure, but to choose hands that can realize equity from OOP.
Here we use an 8-max live cash game with 200bb deep stacks, meaning 100 straddles deep. Assuming no rake, a 4bb min-raise becomes the standard size from most positions. If rake is high or the BTN calls far too loosely, larger opens can be considered in practice from some seats such as the CO.
The SB is the most painful position in a BTN straddle game. Although 0.5bb is already posted, the SB must make the first decision without knowing the intentions of every player behind. When the SB opens, they will almost always see a flop while giving position to someone.
For that reason, the SB's default opening range should be very tight. It should center around big pocket pairs, strong suited broadways, and suited A-x. Suited connectors and small pairs may look appealing, but with multiple players left behind and the BTN defending last, they do not easily become profitable hands.
A 7bb open may look intuitively strong, but it is too large for most SB ranges. A few hands such as AA and AK may be exceptions because they clearly benefit from building the pot, but across a wider range, 4bb is much easier to manage.
The BB is in a better situation than the SB. When opening to 4bb, the BB has already posted 1bb, so the additional cost is 3bb. Even with the same 4bb open, the cost is effectively discounted by 25%. Thanks to this discount, the BB can open more often than the SB and, in some cases, can even use a wider range than UTG.
However, this does not mean any hand can be raised. The BTN often needs to add only 2bb to see a flop, giving him an excellent defending price. If the goal of a BB open is immediate pot capture, the math becomes distorted.
Additional cost to open: 3bb (the BB's 1bb is already invested)
Pot won immediately if BTN folds: 3.5bb
Pure steal breakeven fold frequency: 3 / (3 + 3.5) ≈ 46%
BTN's calling cost: 2bb, pot after call: 8.5bb
BTN's required equity: 2 / 8.5 ≈ 24%
Conclusion: the BB can open thanks to the discount, but opens that rely on BTN folds should not be overvalued
In a standard non-straddle game, open-limping from the BB is almost never used. But BTN straddle games are different. If small raises are frequently called, the value of winning preflop with a raise goes down. In that case, a BB limp becomes an option that lets you stay in more cheaply and observe later action.
You can limp strong hands to induce raises from later positions, and with some weaker suited hands, you can mix limp-call, limp-fold, or limp-3bet depending on the situation. Especially when the table is passive and the BTN mostly calls, the practical value of BB limping increases.
UTG has slightly better postflop position than the SB, but that advantage is offset by having no chips already invested. So in a BTN straddle game, the UTG opening range is not very different from the SB range. Pocket pairs, suited A-x, and suited broadways are the core, with suited 9-x hands gradually added.
As you move to MP, LJ, and HJ, the range naturally widens. But you should not quickly add offsuit broadways the way you might in a normal game. In the BTN straddle structure, OOP flops remain frequent even after you open, so you need to realize equity without positional help. Being suited makes a major difference here.
The CO is different from the other positions. If every player in front of the CO has folded, only one opponent remains: the BTN straddler. The risk of being squeezed almost disappears, and because the BTN has already posted 2bb, he defends widely.
At this point, the CO range can widen substantially to around 150% of the HJ range. Still, the fact that the BTN almost never folds and sees the flop in position remains important. The CO can open wider because there is only one opponent, not because postflop becomes easy.
The BTN's frequency of 3betting to 14bb against the CO's 4bb open can be estimated at a relatively low level of about 13.6%. Most of the rest will be calls. So the CO should include many suited hands, while still treating offsuit hands selectively.
This chart is not a correct answer sheet to memorize, but an example that shows the structure. Pocket pairs enter widely, suited A-x comes in as a block, and suited connectors and gappers enter in a connected flow. By contrast, offsuit hands remain much narrower, around AJo+ and KQo.
The CO is almost the only seat where a 7bb open can be considered. With only the BTN left behind, if the BTN prefers calling over 3betting, you can use a larger size with a strong range while lowering the SPR.
But this is not an automatic strategy either. In a no-rake environment, 4bb is still attractive. Conversely, if live rake is high and the BTN almost always only calls against 4bb, creating small raised multi-street rake pots every time can be costly. In that case, a larger open that generates some folds or builds the pot with a stronger range becomes better in practice.
Pre-open checklist in BTN straddle games
Start extremely tight. Big pocket pairs, strong suited broadways, and suited A-x are the core. The default is 4bb, and 7bb should be considered only with premium hands or a clear exploitative purpose.
Because the additional cost of a 4bb open is 3bb, the BB can play wider than the SB. However, since the BTN gets such a good calling price, the range should not widen based only on steal expectations. At passive tables, limping is also a normal strategy.
Suited hands and pocket pairs enter first. As position improves, the range widens, but offsuit broadways should be added slowly. Being in the HJ does not make every weak broadway an automatic open.
This is the seat that differs most from the HJ. Since the only remaining opponent is the BTN, the range can widen significantly. Still, because you give position to the BTN, the suited-first principle should remain. If rake is high or the BTN calls excessively, a 7bb open also becomes a practical option.
BTN straddles make live games more fun, but they create a very expensive structure for the blinds. The BTN, who has already posted money, decides last, and you will usually be OOP postflop. You have to accept this reality.
The right adjustment is simple. In the blinds, reduce loose steals; understand the BB's discount and limping option; and in the CO, widen your range while keeping it suited-centric. The players who make money in BTN straddle games are not the ones playing more hands, but the ones who know which hands can hold up even from OOP.
원문: https://blog.gtowizard.com/opening-strategy-when-the-button-straddles/
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