PokerSolver
PokerSolver/4-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BB vs SB 3-bet 4bb

BB vs SB 3-bet 4bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 250bb · CO opens 2bb, SB 3-bets to 4bb · Big blind to act

4-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 7.64bbYour cards?
1bb
2bb
4bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 90.5%Call 7.3%Raise 9.2bb 2.1%All-in 249.84bb 0.2%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the big blind (BB) when CO opens 2bb, SB 3-bets to 4bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 250bb?

CO opens 2bb, SB 3-bets to 4bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 250bb: the big blind (BB) folds 90.5%, calls 7.3%, raises 9.2bb 2.1% and goes all-in 249.84bb 0.2%. Always call: KK, TT. Mixed: AA, JJ-QQ, 55-99, 22-33, A2s+, KTs+, Q9s+, Q3s, J9s+, 98s, 96s, 85s-86s, 64s, 53s+, AQo+.

Always fold
44, K2s-K9s, Q4s-Q8s, Q2s, J2s-J8s, T2s+, 97s, 92s-95s, 87s, 82s-84s, 72s+, 65s, 62s-63s, 52s, 42s+, 32s, A2o-AJo, K2o+, Q2o+, J2o+, T2o+, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
KK, TT
Always raise 9.2bb
No hand plays this every time
Always all-in 249.84bb
No hand plays this every time
Mixed
AA, JJ-QQ, 55-99, 22-33, A2s+, KTs+, Q9s+, Q3s, J9s+, 98s, 96s, 85s-86s, 64s, 53s+, AQo+
Settings: 4-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (small blind 0.5bb, big blind 1bb, an ante of 0.16bb from every player, 250bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.91). A jackpot fee on bigger pots is not in this solve, so lines that build big pots may be slightly too loose. Bet sizes are the solved ones; a size that is not here plays like the nearest one.

Fits exactly: no game we have checked.

Close: CoinPoker cash with antes NL50 (rake before the flop in 3-bet pots there, none here).

Rake sources: the ante from 93 of our own CoinPoker hands at $0.25/$0.50 with a $0.08 ante, played 2026-09-30; the caps and the preflop rule from coinpoker.com/games/texas-holdem/, fetched 2026-10-31.