PokerSolver/Heads-up · 4bb · SB 0.5bb · no rake · chip EV/SB open (RFI)

SB open (RFI)

Heads-up · SB 0.5bb · no rake · chip EV (blinds 0.5/1bb, no ante) · 4bb · First to act · 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 · 4bb · SB 0.5bb · no rake · chip EVChange game

PlayersBlinds & rakeStacks

Stacks (bb), if they differSBBB

Pot 1.5bbYour cards?

0.5bb

1bb

Tap your two cards.

Small blind / button's range

1,326 of 1,326 combos get here

Fold 26.2%Call 0%All-in 4bb 73.8%

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 is first to act in Heads-up · SB 0.5bb · no rake · chip EV at 4bb?

First to act in Heads-up · SB 0.5bb · no rake · chip EV, 4bb: the small blind / button (SB) folds 26.2% and goes all-in 4bb 73.8%. Always all-in 4bb: 22+, A2s+, K2s+, Q2s+, J2s+, T2s+, 93s+, 84s+, 74s+, 64s+, 54s, A2o+, K2o+, Q2o+, J2o+, T5o+, 96o+, 86o+, 76o. Mixed: 53s.

Always fold: 92s, 82s-83s, 72s-73s, 62s-63s, 52s, 42s+, 32s, T2o-T4o, 92o-95o, 82o-85o, 72o-75o, 62o+, 52o+, 42o+, 32o
Always all-in 4bb: 22+, A2s+, K2s+, Q2s+, J2s+, T2s+, 93s+, 84s+, 74s+, 64s+, 54s, A2o+, K2o+, Q2o+, J2o+, T5o+, 96o+, 86o+, 76o
Mixed: 53s

Settings: Heads-up · 4bb · SB 0.5bb · no rake · chip EV (small blind 0.5bb, big blind 1bb, 4bb 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 0.96). 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.