Reshaping Your Opening Range Against a 3-Bettor on Your Left

There is a player on your left who three-bets every time you open. Two instincts kick in, and both are wrong. The first is to tighten into a rock, folding your way out of every pot they attack. The second is to fight fire with fire, four-bet-bluffing at random until you are stacking off with air. There is a third option that neither the nit nor the maniac reaches for: reshape the range you open in the first place. Not tighter, not looser. Different. We pulled the exact 100bb solutions from GTO Ranges+ to show which opens survive a three-bet and which quietly have to go.

Not every open is equal against a three-bet

Start with the baseline. At 100bb six-handed, the cutoff opens 29.4% of hands to 2.5bb. When the button three-bets to 6.25bb and the blinds fold, that opening range does not collapse. It continues 73% of the time: 57.1% as a flat call and 15.8% as a four-bet. Only 27% of the range folds. That number is the whole point. More than a quarter of the hands you opened cannot profitably continue against a raise, and they are not spread evenly across your range. They are clustered in one specific place.

The reshaping map

Color the opening range by what each hand does when it faces the three-bet, and the structure jumps out.

The crimson band is the tell. The hands that open fine at equilibrium but fold to the three-bet are almost entirely offsuit broadways and weak suited kings: ATo, KJo, KTo, QJo, QTo, JTo, A9o, A8o, plus Q8s, Q7s, Q6s and K4s, K3s. These are the hands to trim first when the player on your left will not stop three-betting. Notice what is not crimson. The suited connectors, the suited aces and kings, and the pairs mostly stay, either flatting or moving into the four-bet range.

Why the offsuit broadways are the cut

ATo looks like a fine open, and it is, in a vacuum. The problem is what happens next. Against a three-bet it flops top pair with a mediocre kicker, out of position, dominated by exactly the value hands that three-bet it (AK, AQ, AA). It cannot call profitably because it realizes its equity poorly from out of position, and it makes a terrible four-bet bluff because it holds an ace and a broadway that the folding hands do not contain, so it blocks the wrong part of the range. It is a hand with no good continue. When someone over-three-bets you, these hands go from marginally profitable opens to outright losers, so they are the first to leave your Preflop Ranges: Building Your Opening Strategy.

Why the suited hands stay

Suited hands earn their spot two different ways. The ones that flat, like suited broadways and suited connectors, realize equity far better than their offsuit cousins: they flop flushes and straights, they can peel and improve, and they defend a Merged Range that is hard to blast off a pot. The ones that four-bet do the opposite job. The 100bb four-bet range is polarized: premium value (AA, KK, AKs, QQ, AKo) mixed with suited-ace and suited-king bluffs like A5s, A2s, A3s, K5s, K6s. Those bluffs are chosen precisely because they hold a blocker to the value hands that can continue against a four-bet, while keeping a suit that plays if called. That is the hand class you want more of against an aggressive three-bettor, not less.

Turning the map into an exploit

The grid above is the GTO (Game Theory Optimal) baseline, and it is already the answer if you do nothing. But the reason the player on your left is a problem is that they are almost certainly three-betting more than equilibrium. When they do, two adjustments follow directly from the map. First, the crimson hands were already break-even opens, so once your opponent attacks them above baseline, they tip negative. Cut them. Reshaping the top of your range down through the offsuit broadways loses you almost nothing, because those hands were folding to the three-bet anyway. Second, an opponent who over-three-bets is arriving with too many bluffs, which means your four-bet gets through more often and your value four-bets get paid by worse. Lean into the suited-blocker four-bets rather than adding random offsuit hands. You are not playing tighter or looser overall. You are swapping the hands that hate a three-bet for the hands that punish one.

The position tax you cannot ignore

One detail makes all of this sharper. When the cutoff calls the button's three-bet, it plays the rest of the hand out of position. That is why the flatting range is so suited and so disciplined: it has to survive three streets without the informational advantage of acting last. It is also why raising the player on your left, rather than only defending against them, matters so much. The hand that reshapes best is the one that keeps you from bleeding chips in bloated pots where you are always guessing.

The takeaway

When someone will not stop three-betting your opens, do not reach for the two obvious levers. Reshape instead. Cut the offsuit broadways and weak suited kings that fold to the raise and realize badly out of position, and keep or add the suited hands that either flat as a merged range or four-bet as blockers. The exact borders shift with stack depth, position, and the specific seat, so pull your spot in GTO Ranges+, which carries the open and vs-three-bet trees for every position, and see which of your opens are quietly crimson. For the value-and-bluff construction on the other side of this decision, our breakdown of 3-Bet and 4-Bet Ranges That Print Money in 2026 covers how the aggressor picks their hands. Study the shape, not just the width, and the three-bettor on your left stops being a problem and starts being a target.