How to Respond to a 2bb Raise in a Blind-on-Blind Situation in Poker

Learn how to correctly respond to a 2bb open from the small blind in blind-on-blind hands. Tips, analysis, and recommendations from poker solvers.

In poker, when all players fold to the small blind (SB), it creates interesting opportunities for blind-on-blind play—that is, when the hand is played only between the small blind and the big blind (BB). One of the common decisions in this situation is to open-raise to 2 big blinds (2bb) from the small blind. However, modern poker solvers, such as GTOWizard, show that this opening size is far from always optimal. In this article, we will take a detailed look at how modern analysis tools recommend playing in these spots, how strategy changes depending on stack depth, and what practical conclusions PPPoker club players can draw. Modern solvers and their approach to blind-on-blind play GTOWizard is a powerful tool for analyzing poker situations, based on Game Theory Optimal (GTO) principles. It recently introduced a feature for modeling preflop play at tables of up to nine players, allowing for detailed breakdowns of various situations, including blind-on-blind play. The solver not only calculates optimal ranges but also explains why certain decisions are most profitable from a game theory perspective. In particular, GTOWizard does not recommend opening from the small blind with a 2bb raise. The preferred opening size, according to the solver, is 3.5bb, but even this size is used only 9% of the time with 100bb stacks. In most situations, it is more profitable for the big blind to play tighter, since the SB will be out of position postflop, creating a significant imbalance. 100bb stack depth: opening and defense strategies Opening 3.5bb from the small blind When the SB opens to 3.5bb with 100bb stacks, the solver recommends that the big blind defends very wide, using a polarized 3-bet range. This means the BB will 3-bet both with very strong hands (such as top pairs, strong broadways) and with some weak hands as bluffs. However, the majority of hands (56.8%) prefer to just call, especially all suited cards, which play well postflop and can realize equity thanks to position. Opening 2bb from the small blind If the SB opens to 2bb, the solver suggests an even tighter opening range—only 3.1% of all possible hands. The rest are better limped (just calling the big blind without raising). In practice, many players open 2bb much wider than theory recommends, leading to mistakes and loss of profit. BB’s response to a 2bb raise In response to a GTO 2bb raise from the small blind, the BB defends almost their entire range, folding only 0.7% of the time. The only hand that almost always folds is offsuit 7♥2♣. The 3-bet frequency increases by 3% compared to when the SB opens to 3.5bb. If the SB uses a wide open-raising range of 2bb (so-called nodelocked range, i.e., fixed at a certain raise size), the BB hardly folds at all—even weak hands like 7♥2♣ are more often called. In this situation, the share of calls increases and the 3-bet frequency decreases, since the SB has more strong hands in their range and the BB has the opportunity to realize their positional advantage postflop. 50bb stack depth: strategy adjustments When stack depth decreases to 50bb, the solver starts to recommend opening to 2bb from the small blind more often, although limping is still preferred for most hands. The BB’s response to a 2bb raise remains similar to the 100bb strategy: defense is very wide, fold frequency is minimal, and the 3-bet range remains polarized. If the SB opens to 2bb with a wide range (nodelock), the solver advises the BB not to fold any hand—the entire range is either called or 3-bet. The 3-bet frequency drops to 7.8%, since with 50bb stacks the SB can respond to a 3-bet with an all-in, and the BB becomes more cautious to avoid getting into tough spots with marginal hands. 25bb stack depth: new nuances and traps 3bb opens and shoves from the small blind With 25bb stacks, the solver prefers opening to 3bb from the small blind and also adds open-shoves (all-in opens) with certain hands. This puts pressure on the BB and prevents them from realizing equity postflop. BB’s response to a 3bb raise In response to a 3bb raise, the BB includes 3-bet shoves (all-in 3-bets) in their strategy, which becomes an effective tool with short stacks. This move increases fold equity (the chance to make the opponent fold) and prevents the SB from realizing equity after the flop. 2bb opens from SB and BB’s response With short stacks (25bb), the solver more often recommends opening to 2bb—this happens in more than 10% of cases, but limping still dominates. Folding occurs in less than one hand out of ten. In response to a 2bb raise, the BB prefers to call more often, even with premium hands like A♠A♣ and K♥K♦. The reason is the low SPR (stack-to-pot ratio), which makes trapping more profitable: the BB doesn’t inflate the pot preflop, keeping the SB’s weaker range in play to maximize value postflop. If the SB opens a wide range to 2bb (nodelock), the BB calls almost their entire range, folding only the weakest hands (such as offsuit 7♥2♣ and 8♦3♠). Thanks to the low SPR and position, the BB can realize equity even with marginal hands. Summary table: BB defense strategy vs SB raise by stack depth 100bb: BB defends very wide, hardly ever folding. The main strategy is calling, with polarized 3-bets. Position and hand playability become especially important with deep stacks. 50bb: The strategy is similar to 100bb, but the SB can open wider, as playing out of position is less costly. The BB still defends almost the entire range, but is more cautious with 3-bets due to the threat of an all-in from the SB. 25bb: BB calls even more often, including premium hands. The low SPR makes trapping more profitable, and all-in 3-bets become part of the strategy. Fold frequency is minimal. Key takeaways and recommendations for blind-on-blind play Analyzing solver data, several important practical conclusions can be drawn: If your opponent on the SB often opens to 2bb with a wide range, you should defend the BB very aggressively at all stack depths. The main adjustment is not in increasing your fold or 3-bet frequency, but in understanding how your strategy changes as stacks get shorter. With deep stacks (100bb), you realize your positional advantage by calling often. With medium stacks (50bb), the strategy hardly changes. With short stacks (25bb), the low SPR allows you to call more often even with strong hands, and all-in 3-bets become an important part of the strategy. Postflop position and hand playability are key factors when choosing your defense line. Suited hands are especially valuable, as they allow you to realize equity in position. Glossary of terms Blind-on-blind — a situation where only the small blind (SB) and big blind (BB) are involved in the hand after the preflop. Open-raise — the first raise in a hand after all previous players have folded. Limp — calling the big blind without raising. 3-bet — a re-raise, i.e., the second raise in a hand. Polarized range — a range consisting of very strong and very weak hands (for bluffing). SPR (stack-to-pot ratio) — the ratio of the stack size to the pot size after the preflop, affecting postflop strategy. Nodelock — fixing the opponent’s range to a specific action or bet size for analysis. Trapping — playing a strong hand passively to lure the opponent into a trap and win more chips postflop. What this means for PPPoker club players For PPPoker club members, these recommendations can be the key to increasing your win rate in blind-on-blind spots. In online clubs, you often encounter players who open-raise to 2bb from the small blind too wide and do not adjust their range depending on stack depth. By using solver recommendations, you can defend the big blind as profitably as possible, not folding marginal hands and more often realizing your positional advantage. Practical takeaway: if you notice that your opponent on the SB regularly opens with a small raise, don’t be afraid to defend the BB even with weak hands, especially if you have position and the stack isn’t too deep. With short stacks, trapping with premium hands and all-in 3-bets can yield maximum value. It’s important to closely monitor stack depth and adjust your defense strategy accordingly. Finally, if you’re playing from the SB yourself, try not to overuse the 2bb open with a wide range, especially against experienced opponents. It’s better to use limps or larger raises to avoid letting the BB realize equity too cheaply. This approach will help you improve your results in PPPoker clubs and minimize losses in tough blind-on-blind situations.