PokerSolver
PokerSolver/5-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BB vs SB 3-bet 4bb

BB vs SB 3-bet 4bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 100bb · CO opens 2bb, SB 3-bets to 4bb · Big blind to act

5-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 7.8bbYour cards?
1bb
2bb
4bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 91.1%Call 3.8%Raise 9.2bb 3.9%All-in 99.84bb 1.1%
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 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 100bb?

CO opens 2bb, SB 3-bets to 4bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 100bb: the big blind (BB) folds 91.1%, calls 3.8%, raises 9.2bb 3.9% and goes all-in 99.84bb 1.1%. Always raise 9.2bb: AA. Mixed: 66-KK, 33, A9s+, A2s-A7s, KTs+, K5s-K6s, QJs, Q6s, Q4s, J5s-J6s, T8s+, 97s, 76s, 65s, 54s, AJo+.

Always fold
44-55, 22, A8s, K7s-K9s, K2s-K4s, Q7s-QTs, Q5s, Q2s-Q3s, J7s+, J2s-J4s, T2s-T7s, 98s, 92s-96s, 82s+, 72s-75s, 62s-64s, 52s-53s, 42s+, 32s, A2o-ATo, K2o+, Q2o+, J2o+, T2o+, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
No hand plays this every time
Always raise 9.2bb
AA
Always all-in 99.84bb
No hand plays this every time
Mixed
66-KK, 33, A9s+, A2s-A7s, KTs+, K5s-K6s, QJs, Q6s, Q4s, J5s-J6s, T8s+, 97s, 76s, 65s, 54s, AJo+
Settings: 5-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (small blind 0.5bb, big blind 1bb, an ante of 0.16bb from every player, 100bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 23.9). 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.