PokerSolver
PokerSolver/Heads-up · 20bb · SB 0.5bb · no rake · chip EV/SB vs BB iso raise 2.5bb

SB vs BB iso raise 2.5bb

Heads-up · SB 0.5bb · no rake · chip EV (blinds 0.5/1bb, no ante) · 20bb · SB limps, BB isolates to 2.5bb · Small blind / button to act

Fits exactlyGGPoker Spin & Gold x2, x3, x4, x5, x10, x50, x100, MaxPokerStars Spin & Go x2, x3, x4, x5, x10, x25, x50, x100, top tierpartypoker SPINS Overdrive 2-2.99x, 3-3.99x, 4-4.99x, 5-9.99x, 10-24.99x, 25-119.99x, 120-239.99x, 240x+WPT Global Global Spins x2, x3, x5, x10, x25, x120, x240, x6,000
Close4 games
  • Winamax Expresso x2, x3, x4, x5, x10, x20, x100, x400, x1,000, jackpotits pages do not say whether any level has an ante
  • Winamax Expresso Nitro every multiplierits pages do not say whether any level has an ante
  • iPoker Twister x2, x3, x5, x8, x50, x1,000its pages do not say whether any level has an ante
  • ACR Poker SPINZ x2, x3, x4, x5, x10, x25, x50, x100, x12,000its blinds are not published
Cash
Heads-up · 20bb · SB 0.5bb · no rake · chip EVChange game
Stacks (bb), if they differ
Pot 3.5bbYour cards?
1bb
2.5bb

Tap your two cards.

Small blind / button's range

1,260 of 1,326 combos get here
Fold 29.5%Call 58.3%Raise 6.25bb 3.6%All-in 20bb 8.7%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the small blind / button (SB) when SB limps, BB isolates to 2.5bb in Heads-up · SB 0.5bb · no rake · chip EV at 20bb?

SB limps, BB isolates to 2.5bb in Heads-up · SB 0.5bb · no rake · chip EV, 20bb: the small blind / button (SB) folds 29.5%, calls 58.3%, raises 6.25bb 3.6% and goes all-in 20bb 8.7%. Always call: QQ-KK, A4s-A8s, K2s+, Q2s+, J2s+, T2s+, 92s+, 83s+, 73s+, 62s+, 52s+, 42s+, 32s, K8o+, K6o, Q7o+, J7o+, T7o+, 97o+, 86o+, 76o, 65o, 54o. Always raise 6.25bb: AQs+. Always all-in 20bb: ATo. Mixed: 33-JJ, AJs, A9s, A2s-A3s, 82s, 72s, AJo-AQo, A2o-A9o, K7o, K2o-K5o, Q6o, Q3o-Q4o, 96o, 64o, 53o.

Always fold
Q5o, Q2o, J2o-J6o, T2o-T6o, 92o-95o, 83o-85o, 73o-75o, 63o, 52o, 43o
Always call
QQ-KK, A4s-A8s, K2s+, Q2s+, J2s+, T2s+, 92s+, 83s+, 73s+, 62s+, 52s+, 42s+, 32s, K8o+, K6o, Q7o+, J7o+, T7o+, 97o+, 86o+, 76o, 65o, 54o
Always raise 6.25bb
AQs+
Always all-in 20bb
ATo
Mixed
33-JJ, AJs, A9s, A2s-A3s, 82s, 72s, AJo-AQo, A2o-A9o, K7o, K2o-K5o, Q6o, Q3o-Q4o, 96o, 64o, 53o
Settings: Heads-up · 20bb · SB 0.5bb · no rake · chip EV (small blind 0.5bb, big blind 1bb, 20bb stacks, no rake; chip EV: every chip is worth the same, as it is when only the winner is paid and heads-up). Solver: HoldemResources Calculator (HRC) (HRC CI 8.78). Bet sizes are the solved ones; a size that is not here plays like the nearest one.

Sources for the games it fits: ggpoker.com/poker-games/spin-gold (prize table in its script js/funds29.8816e65c.js; fetched 2026-10-31); chips and blinds from worldpokerdeals.com/blog/spin-gold-the-ultimate-guide-on-ggpoker-network (updated 2026-05-11; its 26-level blind table lists no ante) and somuchpoker.com/news/best-spin-and-go-poker-sites-2026 (updated 2026-10-16), fetched 2026-10-31; pokerstars.com/poker/spin-and-go (stacks and prize tables; fetched 2026-10-31); blinds from worldpokerdeals.com/blog/pokerstars-new-spin-go-multipliers-and-1000-spins (2026-05-27; its blind table lists no ante), fetched 2026-10-31; partypoker.com/en/poker/offers/dynamic-structure (stacks, prize shares and the 20-level blind table, which lists no ante), fetched 2026-10-31; wptglobal.com/how-to-play/global-spins (stacks and prize shares; fetched 2026-10-31); blinds from worldpokerdeals.com/blog/global-spins-wpt-global (2023-11-23; its blind table lists no ante) and somuchpoker.com/news/best-spin-and-go-poker-sites-2026 (2026-10-16); winamax.fr/expresso (stacks, first blinds and prize tables; the same on winamax.es), fetched 2026-10-31; worldpokerdeals.com/blog/ipoker-twister-guide (2026-01-29; stacks and splits) and pokerstrategy.com/strategy/sit-and-go/twister-poker-let-go (first blinds), fetched 2026-10-31; worldpokerdeals.com/blog/winning-poker-network-new-1-000-000-spin-go (2025-12-05; stacks only), fetched 2026-10-31.