When no one has raised yet and you are the first to voluntarily enter the pot preflop, that spot is called RFI (Raise First In). In 6-max, the set of hands you can open varies sharply by position from UTG through SB.
This article builds on Preflop Hand Ranges by Position. After you know how to read range charts and baseline frequencies, we focus on why ranges are that wide and how to choose hands. Reading What Is GTO in Poker? and Why Position Matters in Texas Hold'em first will help.
What Is RFI?
RFI means raising to enter the pot after everyone in front of you has folded. Only the forced blinds are in the pot; you add chips voluntarily to play.
nlh.poker uses 6-max tables only. You can RFI from UTG, MP, CO, BTN, and SB (BB always defends against someone else's raise). An RFI range is the set of hands you raise with from each position.
The HUD RFI stat tracks how often you raised when you had a first-in opportunity. It does not count limps—important for SB, as explained below. For related HUD metrics, see VPIP and PFR Explained.
Why RFI Ranges Change by Position
The same hand can have very different EV opened from UTG vs the button. Five main factors set range width:
- Players behind: UTG has up to five players left; the button only has the blinds. More players behind means more 3-bet and call risk.
- Postflop position: the button is almost always IP (in position) after the flop. UTG and MP are often OOP, which lowers the value of hands that struggle to realize equity.
- 3-bet tolerance: wider opens invite more 3-bets. Hands that cannot defend against a 3-bet should be removed or opened less often.
- Fold equity: the chance everyone folds and you win the blinds. CO and BTN steal often; weak hands can still open profitably.
- Rake and sizing: in cash games, rake eats thin edges. SB is special because you already posted 0.5bb.
GTO-Leaning RFI Frequencies at 100bb (6-Max)
These benchmarks come from solver analysis at ~100bb effective stacks (2.5bb opens; SB uses 3bb). Memorize these as starting points and adjust for opponents.
| Position | RFI frequency | Notes |
|---|---|---|
| UTG | ~17% | Tightest. Strong value plus a few speculative hands for board coverage |
| MP | ~21% | Wider than UTG; weak Kxs, Qxs, and low suited connectors often drop out |
| CO | ~28% | BTN 3-bets are the main threat. Many marginal hands that open on BTN fold here |
| BTN | ~43% | No limping. Outside SB, open = raise only (see below) |
| SB | Raise ~24% + limp ~38% (total ~62%*) | Separate limp and raise hand sets in a mixed strategy. Not the same as HUD "raise rate" |
*SB ~62%: this is total participation (limp + raise). RFI (raises only) is ~24%; HUD RFI tracks raises, not limps. SB is the only row that reads differently.
The beginner guide's "UTG 18–20%, BTN 45–55%" points in the same direction. Here we explain why those widths make sense.
Open Size and Range Width
Standard 6-max cash opens are 2.5bb (UTG through BTN). At ~100bb, 2bb gets called too often; 3bb wins more folds but makes bluffs expensive—2.5bb sits in the middle. From SB, playing OOP, 3bb is common to discourage calls.
Size and range width are paired decisions. Smaller opens get called more; marginal hands shift toward "cheap postflop entry." Larger opens win more folds but lose more when 3-bet. RFI ranges are built to survive 3-bets at that size—keep sizing in mind when applying the four axes below.
Four Axes for Building an RFI Range
Instead of memorizing charts alone, explain each hand with these four lenses:
1. Raw Equity and Fold Equity
Base strength vs the blinds' defense ranges. On BTN, high fold equity can make opens profitable even when raw equity alone would suggest a fold.
2. Playability and Implied Odds
Suited connectors and small pairs look weak preflop but have implied odds when they flop sets or strong draws. At deep stacks they stay in range—but 76s might open on BTN and fold UTG because of 3-bet pressure and playing OOP.
3. Board Coverage
Flop textures are random. GTO ranges sometimes open 22 from UTG at low frequency while opening 88 less often—not because 22 is stronger, but to build strong hands across a variety of board textures. Opening only premium hands makes you easier to block and exploit.
4. Link to 3-Bet Defense
RFI ranges are not isolated. Wider opens require hands that can call or 4-bet vs 3-bets. Avoid opens that become pure folds to a 3-bet—balance 4-bet candidates and call candidates.
By Position: What to Include and Exclude
UTG (~17%)
Five players behind. Range is value-heavy with minimal board coverage.
- Include: 77+, AJs+, KQs, AQo+, A5s–A4s (suited aces that also 4-bet bluff)
- Exclude: weak Kxs, Qxs, low suited connectors, weak offsuit broadways (KJo, QJo, etc.)
You will play OOP vs 3-bets, so do not open hands that cannot defend against a 3-bet.
MP (~21%)
Slightly wider than UTG; still four players behind.
- Add: 66+, ATs+, KJs+, QJs, JTs, KQo
- Still exclude: K2s–K5s, Q2s–Q5s, J4s–J6s, weak offsuit connectors
CO (~28%)
The most aggressive non-button seat, but BTN 3-bets are the main threat. Marginal hands that BTN 3-bets often should fold from CO.
- Include: all pairs, A2s+, K9s+, Q9s+, J9s+, T9s, 98s, ATo+, KJo+, QJo
- Exclude: in addition to K2s–K5s dropped at MP, some K6s–K8s also drop at CO. Q2s–Q4s, J4s–J6s, A7o–A2o, offsuit connectors
CO vs BTN often comes down to one strong 3-bettor behind vs two (including blinds). Same hand: fold CO, open BTN.
BTN (~43%)
The best RFI seat in 6-max. Outside SB, do not limp—open = raise only (UTG is also raise-or-fold; BTN's hallmark is never limping).
- Why no limp: limps invite SB and BB in cheaply, create multiway pots, and hurt EV with rake. You risk facing a raise and choosing between paying more and folding.
- Range width: all pairs, A2s+, K2s+, Q2s+, most suited connectors and gappers, K8o+, Q9o+, J8o+, T8o+, 98o+, etc.
- Exploit: vs over-folding blinds, widen toward 55–60%. Vs strong 3-betting blinds, play tighter than 43%.
SB (Special) — Contrast with BTN
SB is OOP postflop but already posted 0.5bb, so you have more incentive to play than other seats. Key differences vs BTN:
| BTN | SB | |
|---|---|---|
| Limp | Never | GTO uses separate limp and raise hand sets in a mixed strategy |
| RFI (raise rate) | ~43% | ~24% (separate from limps) |
| Participation (incl. limps) | ~43% (= raise rate) | ~62% |
- Mixed strategy (separate limp and raise ranges): in GTO, SB first-in play assigns some hands to limp and others to a 3bb raise, then uses each at the right frequency (this is not limp-re-raising—raising again after you limped). Limp to see flops cheaply, keep overall raise frequency down, and reduce BB 3-bet effectiveness.
- Raise-only simplification: many players use raise-or-fold like BTN. Then RFI (raise rate) is often ~35–45% depending on BB tendencies (see range basics on SB). Vs an over-folding BB, you can widen past 45% toward ~50%.
- Sizing: 3bb standard OOP. Too small gets called; too large wins folds but raises bluff cost.
Exploitative Adjustments
GTO ranges assume opponents defend correctly. In practice, shift width like this:
| Opponent tendency | RFI adjustment |
|---|---|
| Blinds over-fold | Widen on BTN, CO, SB (steal focus) |
| Players behind 3-bet too much | Cut marginal opens; keep 4-bet bluffs like A5s but lower frequency |
| Passive players behind (few 3-bets) | Hold or slightly widen; add hands that play multiway |
| You get countered (light 4-bets, etc.) | Tighten temporarily; return to value-heavy opens |
For exploit risk and balance, see Exploitative vs GTO Poker.
Common Misconceptions
Summary
- RFI = first raise into the pot after everyone folds to you
- Range width depends on players behind, position, 3-bet risk, and fold equity
- 100bb 6-max RFI (raise rate): UTG 17% → MP 21% → CO 28% → BTN 43% → SB ~24% (raise-only simplification: ~35–45%)
- SB participation (limp + raise) ~62%—separate from HUD RFI
- Hand selection: equity, playability, board coverage, 3-bet tolerance
- BTN never limps; SB can use separate limp and raise hand sets. Adjust width for opponents
Solid RFI ranges connect to 3-bet defense and postflop play. After sessions on nlh.poker, review hands: was this open right for position? Could the range survive a 3-bet? Next, pair this with Dynamic vs Static Boards and Continuation Bet Basics for life after you open.
