In online poker games, limps and weak opens still show up constantly, especially when you are multi-tabling and the pool contains a mix of regulars and recreational players. Your job is to punish that dead money with isolation raises. An ISO is not a fancy move, it is a disciplined EV grab that sets up a heads up pot where your positional advantage and initiative can print.
If you ISO and end up multi way, you did not isolate, you just built a pot with a wider range. So we are going to treat ISO raising like a skill, not a vibe, with clear sizing, range construction, and an honest look at who is left to act.
What ISO Raising Actually Is
An isolation raise is a preflop raise designed to get one specific weaker player to call while pushing out the players behind you. Most often it happens after one or more limpers, or after a weak open where you expect callers.
Your goals are simple. Win the pot now, or play a heads up pot versus the target with position and initiative. The bonus is you often pick up the blinds and limps without resistance, which is huge in a raked online environment.
Why ISO Raises Make More Money Than Passive Lines
Passive play, especially limp behind and set mining, is how you donate to rake and let the table realize equity for free. In a typical online cash pool, rake is taken when pots see a flop. That means the cheapest way to win is to end the hand preflop, or play fewer multi way flops.
When you ISO, you create EV in three places.
- Dead money capture, limps and blinds are already in there, so your raise has immediate fold equity.
- Equity denial, hands like 76s and A5s hate facing a raise where they cannot see a flop cheaply.
- Positional and initiative edge, you get to c bet first on many boards, and you control pot size.
Relative strength is everything. An ISO range is not just about your two cards, it is about how your hand performs versus the caller, plus how well it plays postflop with initiative.
The Biggest Mistake: Ignoring Who Is Left To Act
The most important question before you ISO is not, what do I have. It is, who can punish me behind.
If you are on the BTN facing a limp and the SB is a strong reg who 3 bets aggressively, your ISO range must tighten and your sizing must be consistent with a plan. If you are in the CO and there are two loose passive players in the blinds, you can ISO wider and size bigger because you are more likely to get the exact call you want.
Context dictates strategy. When the players behind are tight, your fold equity goes up, and your ISO becomes a straightforward EV print. When the players behind are aggressive, you must either tighten, increase hands that can continue versus 3 bets, or choose a different line.
ISO Sizing: Standard, But Not Lazy
ISO sizing is not about looking strong. It is about pricing out junk while still getting called by the target. In online poker, smaller opens are common, so your ISO must clearly separate itself from a normal open size.
- Versus one limper, a strong baseline is 4bb to 5bb in position, and 5bb to 6bb out of position.
- Add per limper, add about 1bb for each extra limper as a starting point.
- Adjust for the target, versus a sticky caller, go larger. Versus a fit or fold player, you can go slightly smaller and print on folds.
Your size should also reflect the players behind. If the blinds defend wide and call too much, you want a larger size with hands that dominate their calling range. If the blinds 3 bet a lot, you can keep a size that lets you continue comfortably, or tighten your ISO range and avoid building pots with hands that fold too often to 3 bets.
Building Your ISO Range: Value, Dominance, Playability
Think of your ISO range as three buckets.
- Pure value, hands that are happy to get called and can stack top pair type opponents, like AJ+, KQ, and strong pairs.
- Dominance driven, hands that crush the typical limp call range, like A9s to A2s, KTs, QTs, and suited broadways.
- Playability bluffs, hands that can realize equity and apply pressure postflop, like suited connectors and suited one gappers, when the table dynamic allows.
Anti hope poker matters here. A small pair is not automatically a green light to ISO if you expect a call from multiple players and you will be out of position. That is the classic set mining trap. You are paying to see flops in raked pots without initiative, and you are relying on a low frequency event to get paid.
Instead, ISO small pairs more often when you are in position, the limper is a calling station who overpays postflop, and the players behind are unlikely to squeeze. Otherwise, just fold them and move on.
Exploitative ISO Adjustments by Player Type
Most online sites have a predictable distribution of profiles. You can exploit them hard without becoming unbalanced in a dangerous way.
Loose passive limper, they limp call too wide and overfold turns. ISO bigger. Use hands that make top pair with good kickers, and suited hands that can barrel on equity turns. Your biggest win comes from value betting, not from fancy bluffs.
Fit or fold recreational, they limp call preflop but surrender on high card boards. ISO a bit wider, and c bet frequently on A high and K high textures. Keep turn aggression for boards where your range stays stronger.
Trappy limper, the rare player who limp reraises premiums. If you see it once, respect it. Tighten your ISO range slightly and be ready to fold the weak top of your bluff bucket to a limp reraise. Do not donate.
Thinking reg in the blinds, they squeeze and they are not scared of isolation lines. ISO fewer hands that cannot continue versus a 3 bet. Keep hands that can 4 bet for value, or call 3 bets in position and perform postflop.
What You Do When You Get Called Matters More Than the ISO
The ISO raise wins money preflop, but it wins multiples when your postflop plan is sharp. Your main edge comes from range advantage and initiative. Use it deliberately.
- High card flops, Axx and Kxx boards generally favor the iso raiser because you have more strong aces and kings. C bet small to medium frequently.
- Low connected flops, boards like 987 are closer and can favor limp callers who arrive with suited connectors and two pairs. Slow down, check back more, and choose higher equity barrels.
- Paired flops, like K77 or 883, are great for small c bets because they are hard to hit and your perceived range is strong.
You will not win every pot. The goal is to win enough uncontested pots, and to build bigger pots when you have genuine range and nut advantages.
Rake Awareness Without Being Paralyzed
Rake is a constant tax in online cash. It punishes small edges and multi way pots. That is not a reason to stop playing hands, it is a reason to choose high EV structures.
ISO raising helps you in two ways. It increases your immediate fold equity, and it filters pots toward heads up scenarios where your positional edge is worth something. Still, do not ISO every limp with any two cards. If you end up in bloated, multi way, low SPR pots with marginal hands, rake will finish the job your opponents started.
Hand Scenario: The Squeeze Proof ISO
Game: Online 6 max cash, 100bb effective. Hero on the BTN.
Preflop: UTG limps 1bb. HJ folds. CO folds. Hero looks down at K♠J♣. SB is a tighter reg, BB is a loose passive caller. Hero ISO raises to 5bb. SB folds. BB calls. UTG calls.
Flop: K♥7♣2♦. Pot is 16bb.
Action: BB checks. UTG checks. Hero bets 5bb.
This is a clean ISO payoff spot. You used a larger size to punish two players who will call too much, and you landed top pair. The small c bet targets their wide limp call ranges and denies equity from hands like QJ, T9, and random suited junk. If one player calls, you proceed with value on many turns. If both call, you shift into pot control on bad runouts and value bet harder on safe cards. You are not guessing, you are executing a plan built around initiative and range advantage.
Common ISO Mistakes You Must Stop Making
- ISO too small, you invite the entire table in and lose the isolation goal. You also give great pot odds to hands that smash you when they connect.
- ISO hands that cannot continue, if you fold every time a competent player squeezes, you are lighting money on fire. Choose hands with continuation plans.
- Limp behind with playable hands, you give up initiative, you create multi way pots, and you pay rake more often. If a hand is good enough to play, it is often good enough to raise, given the right players behind.
- Set mining as a default, small pairs are fine, but only in the right structure. Do not pay to hope.
Your ISO Checklist in Real Time
When you are multi-tabling online, you need a fast decision loop. Use this.
- Target, who is the player you want to play against, and will they call.
- Threat, who is left to act, and will they 3 bet or squeeze.
- Size, what size forces mistakes from the callers while discouraging the tag alongs.
- Plan, what flops you are c betting, and what turns you are barreling.
Key Takeaway
ISO raising is an EV tool, not a habit. Pick a target, account for who is left to act, then choose a size that forces folds or creates a heads up pot with initiative. Build your ISO range around value, dominance, and postflop playability, and stop donating with limp behind lines and hope based set mining.
