Building Your Preflop RFI Ranges by Position (Without Memorizing a Chart)

Stop cramming 13×13 grids. Learn the four drivers that generate every Raise-First-In range so you can rebuild any position's opens live at the table.

Most players learn preflop the same painful way: they download a chart, stare at a 13×13 grid until their eyes glaze over, then forget half of it by the time they're actually at the table. Worse, a memorized grid teaches you what without ever teaching you why — so the moment the situation shifts (antes kick in, you're 22bb deep, the table is splashy), the chart is useless and you're guessing.

Here's the better way: ranges are derivable. Every sensible Raise-First-In (RFI) range is the output of four pressures pushing against each other. Understand those four drivers and you can reconstruct any position's range from scratch, adjust it on the fly, and stop treating preflop like a memory test.

This guide assumes a default of 9-handed, 100bb-deep MTT play with antes unless stated otherwise. Frequencies are ballpark figures, not solver-exact outputs — they move with stack depth, ante structure, and how your table actually plays.

The Four Drivers

Every open is a tug-of-war between four forces:

  1. Equity & playability — How good is the hand on its own, and how easily does it make money postflop? Raw equity matters, but so does how the hand realizes that equity. AJo and 76s have similar raw equity against a random hand, but they earn it in completely different ways.
  2. Positional advantage — How many players still act behind you? The more seats left to act, the more likely someone wakes up with a real hand, and the more often you'll be playing the rest of the pot out of position.
  3. 3-bet / squeeze risk — Specifically, the threat of getting raised off your hand before the flop. The earlier you open, the more players can 3-bet you, and the more you have to respect that you might face a re-raise and have to fold or commit chips.
  4. Antes / Big Blind Ante (BBA) — Dead money in the middle that improves the immediate price of opening, which widens every range. This is the driver most intermediate players underweight.

Hold these four in your head and the whole positional staircase — tight under the gun, loose on the button — falls out naturally. Let's walk through each driver, then go seat by seat.

Driver 1: Equity and Playability

Two hands with identical equity against a random holding can be worth wildly different amounts as opens, because equity realization (R%) differs.

This is why AKs is a premium open from every seat while A9o is a fold from early position. It's also why suited connectors like 76s and 87s creep into your range earlier than offsuit junk like K8o, despite the offsuit hand having a high card "kicker." The connector realizes its equity; the offsuit hand mostly makes weak top pairs and gets out-kicked.

Rule of thumb: when deciding whether a marginal hand opens, ask "how does this hand actually win a big pot?" If the answer is "it doesn't, it just makes second-best pairs," fold it from early position.

Driver 2: Positional Advantage (Players Behind)

This is the master dial. The number of players left to act determines almost everything.

From UTG at a 9-handed table, eight players can wake up with a hand behind you. From the button, only two (the blinds). That difference is enormous:

From the button, you'll be in position on every postflop street against the blinds. That positional edge is worth real equity, which is why hands that are clear folds UTG (like K9o, Q8s, 53s) become comfortable button opens.

Driver 3: 3-Bet and Squeeze Risk

Closely related to driver 2 but worth separating: the more players behind you, the more 3-bet risk you carry. When you open UTG and someone in the cutoff 3-bets, you're stuck out of position with a capped range against a polarized re-raise — a genuinely uncomfortable spot.

This punishes thin opens from early position twice over:

From the button, squeeze risk is minimal — only the two blinds can 3-bet, and they're 3-betting out of position. That's a far more comfortable spot to face, which again pushes button opens wider.

Driver 4: Antes and the Big Blind Ante

Here's the driver that quietly reshapes everything once the antes come in.

Without antes, opening risks (say) 2.2bb to win 1.5bb in the blinds. With a Big Blind Ante, one full big blind ante goes into the pot before any cards are dealt. Now you're risking 2.2bb to win 2.5bb of dead money. The immediate price to steal got dramatically better.

Let's make it concrete. Suppose you open to 2.2bb as a pure steal attempt:

The fold-equity break-even for a pure steal is risk / (risk + reward). No ante: 2.2 / (2.2 + 1.5) ≈ 59% of the time they need to fold. With BBA: 2.2 / (2.2 + 2.5) ≈ 47%. You need them to fold far less often, so a much wider range of hands becomes a profitable open.

Antes widen every range, but they widen the late positions most, because that's where you're opening primarily to collect dead money rather than to make a hand. A real BBA structure can push button opening frequency from the high-40s into the mid-50s percent.

Putting It Together: Position by Position

With the four drivers in hand, here's the staircase. The percentages are approximate ballparks for 100bb, 9-handed, antes in play — treat them as the shape of the range, not gospel.

| Position | Approx. RFI % | Character of the range | |---|---|---| | UTG | ~12–15% | Tight, value-heavy: big pairs, strong broadways, best suited aces, a few high suited connectors | | UTG+1 / EP | ~14–16% | Slightly wider than UTG, same shape | | MP / Lojack | ~17–20% | Add more suited broadways, more pairs, lower suited connectors | | Hijack | ~20–25% | Suited gappers appear, weaker suited aces, KJo/QJo-type offsuit broadways | | Cutoff | ~26–32% | Most suited hands, all pairs, offsuit broadways down to KTo/QTo, suited connectors and one-gappers | | Button | ~42–55% | Very wide: any pair, any suited ace, most suited kings, suited connectors/gappers, offsuit broadways and offsuit aces | | Small Blind | ~30–45% (raise-only) | Wide but careful — you're always OOP postflop; many players go raise-or-fold here | | Big Blind | n/a (RFI only when folded to) | Closes the action; "RFI" applies only in the rare folded-to-BB-in-multiway scenario |

Notice the jump from cutoff to button: roughly 30% to 50%. That single seat change nearly doubles your opening range, driven entirely by drivers 2 and 3 — one fewer player behind, far less 3-bet risk, and guaranteed position postflop.

UTG (and UTG+1): Respect the Eight Behind

Your range here is built almost entirely on equity (driver 1) under heavy 3-bet risk (driver 3). You want hands that flop well, dominate the hands that call you, and survive a 3-bet.

Offsuit hands outside the top broadways (KJo, QJo, ATo) mostly stay out — they get dominated and play badly when 3-bet.

Lojack and Hijack: The Range Loosens

One or two fewer players behind. 3-bet risk drops a notch, position improves. Now you add:

Cutoff: Stealing Becomes the Point

Only the button and blinds are left. The cutoff opens roughly a third of hands. The motivation shifts: you're no longer opening purely for value, you're also opening to take the blinds and antes when folded to. Add:

Button: Maximum Width

The button is where all four drivers align in your favor: only the two blinds behind (driver 2), minimal squeeze risk (driver 3), guaranteed position postflop (driver 1's realization boost), and antes sweetening the price (driver 4). You're opening to win the dead money outright a huge fraction of the time.

A reasonable button RFI with antes runs roughly 45–55% of hands:

If the blinds defend aggressively and 3-bet a lot, tighten up — driver 3 reasserts itself even on the button. If they fold too much, open even wider; nearly any two cards print when they over-fold to a sweetened price.

The Blinds: A Different Animal

Small blind: when it's folded to you, only the big blind is left, but you'll be out of position for the entire hand. That kills equity realization (driver 1) and changes your approach. Many strong players adopt a raise-or-fold strategy here — no limping, no flatting — opening 30–45% with a deliberately larger sizing to deny the BB a cheap flop. (A mixed limp/raise strategy is theoretically sound but harder to execute and easier to exploit; raise-only keeps you clean.)

Big blind: the BB doesn't really "RFI" — by the time it's your turn the pot has usually been opened, so your job is defending against a raise (a separate topic involving great pot odds and the closing-action advantage). The only RFI-flavored spot is the rare case where it folds to you in a blind-vs-blind situation that's already been opened — not a standard RFI scenario.

How Short Stacks Change the Picture

Everything above assumes ~100bb. As stacks shrink, the drivers reweight:

The four drivers still apply; their weights just change. Equity realization (driver 1) matters less when there's no deep postflop, while immediate fold equity and dead money (drivers 3 and 4) matter more.

Reconstructing a Range Live — A 30-Second Method

You're at the table, it's folded to you in the hijack, antes are in, 100bb deep, and you've forgotten your chart. Here's the reconstruction:

  1. Count players behind. Hijack = four behind. Moderate 3-bet risk, moderate position. Start from a "middle" baseline — roughly a fifth of hands.
  2. Check the structure. Antes in? Widen, especially the steal-oriented bottom of the range. No antes? Tighten back up.
  3. Check stack depth. 100bb — full playability, keep your suited connectors and small pairs in. 25bb — trim the speculative stuff.
  4. Check the table. Sticky blinds who never fold and 3-bet light? Tighten (driver 3 spikes). Nitty blinds who over-fold? Widen toward button-like numbers.
  5. Build outward from the core. Start with the hands that are always in (premiums, strong broadways, decent suited aces and connectors), then add marginal hands until the range "feels" the right width for your seat and the structure.

That's it. You're not recalling a grid — you're computing a range from its drivers. It'll be slightly off from a solver, and that's fine; being directionally correct on every street beats being grid-perfect in the one spot you memorized and lost everywhere else.

Common Mistakes to Avoid

The Takeaway

A preflop RFI range isn't something you memorize — it's something you generate from four inputs: the hand's equity and playability, how many players act behind you, the 3-bet/squeeze risk you face, and the dead money the antes provide. UTG opens are tight because all four drivers point toward caution; the button is wide because they all point toward aggression; and antes shift every range looser by improving the immediate price.

Learn to feel those four pressures and you can rebuild any position's range at the table, adjust it for stack depth and table tendencies, and never be caught flat-footed when the situation doesn't match the grid you crammed.

If you want to pressure-test your ranges against solver baselines and drill the reconstruction until it's automatic, shadepoker has range tools built exactly for that — but the goal is always the same: understand the drivers, and the chart becomes optional.