The Big Blind is a defensive position — you close the action preflop and get a discount to call. GTO defends wide vs small opens (especially from the BTN) but knows when to fold vs tight UTG ranges. Mastering BB defense is the fastest win-rate boost for most players. At 20bb you are in push/fold and short-stack territory — many hands become all-in or fold, and postflop play is shallow. GTO at 20bb is about maximizing fold equity and avoiding dominated calls. Rake matters less; raw equity matters more. Below is the GTO range grid for BB at 20bb (6-max, rake 5% cap $3) — green = raise, amber = call, red = fold. Hover any hand for exact frequencies and EV.
84.0%
Raise (142)
0.0%
Call (0)
16.0%
Fold (27)
Hover or tap a hand to see GTO action, frequencies, and EV.
Pre-computed with TexasSolver · 0.5% exploitability · Rake 5% cap $3 · 6-max
| Action | Hands | Frequency | Avg EV (bb) |
|---|---|---|---|
| Raise | 142 / 169 | 84.0% | 1.40 bb |
| Call | 0 / 169 | 0.0% | 0.00 bb |
| Fold | 27 / 169 | 16.0% | 0.18 bb |
From the Big Blind, defend wide vs BTN/SB opens (call with any suited hand, most offsuit broadways, and pairs), but fold more vs UTG/HJ. Vs a 2.5x BTN open at 100bb, GTO defends ~55–60% — if you fold more, regs exploit you by opening 100%. Short-stack strategy: shove or fold with many hands — ATo+, KJs+, and pairs 66+ are often jams from late position. Limping is almost never GTO at 20bb. Study push/fold charts alongside these ranges.
Pro tip: BB defense is the #1 leak for microstakes players. If you fold BB vs BTN more than 45% at 100bb, regs print money against you. Study which suited hands GTO calls and why.
GTO open-raise frequency for BB at 20bb depends on rake and field, but our TexasSolver-based chart (0.5% exploitability, 5% rake cap $3) shows the solver-preferred raise/call/fold mix for all 169 hands. Hover the grid above for exact frequencies per hand. Generally, BB is defensive (call-heavy vs steals) — see the grid for 20bb specifics.
Use the 3-step method: (1) Quiz yourself — cover the grid and ask 'What does GTO do with AJo BB 20bb?' (2) Check and note surprises. (3) Drill the borderline hands (the amber/mixed cells) with Lab's spaced-repetition drills. 10 minutes a day per position beats cramming.
These ranges are solved for 6-max cash, 5% rake cap $3, which matches most micro-to-mid stakes online games. At very low stakes with high rake or vs extremely tight/loose opponents, exploitative adjustments beat pure GTO — but you need to know GTO first to know when to deviate. See our Methodology for solver details.
No. This chart is for post-hand study only. Using any solver chart or AI assistance during live play violates PokerStars and GGPoker Terms ofService and risks account bans and fund seizure. Study off-table, play your A-game on-table.
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