PokerSolver
PokerSolver/4-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BB vs CO open 3bb

BB vs CO open 3bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 100bb · CO opens 3bb · Big blind to act

4-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 5.14bbYour cards?
1bb
3bb
0.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 66.5%Call 22.8%Raise 6/9bb 10.7%
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 3bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 100bb?

CO opens 3bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 100bb: the big blind (BB) folds 66.5%, calls 22.8% and raises 6/9bb 10.7%. Always call: 99, 22-44, A8s-ATs, A3s, K2s-K3s, Q9s-QTs, Q7s, Q3s-Q4s, T7s, 96s-97s, 85s+, 74s-75s, 64s, 53s, 43s, A8o-AJo, KJo, QTo+. Always raise 6/9bb: JJ+, AQs+, KQs, T8s, AKo, JTo. Mixed: TT, 55-88, AJs, A4s-A7s, A2s, K4s-KJs, QJs, Q8s, Q5s-Q6s, J6s+, T9s, T6s, 98s, 76s, 65s, 54s, AQo, A5o, KQo, KTo, T9o.

Always fold
Q2s, J2s-J5s, T2s-T5s, 92s-95s, 82s-84s, 72s-73s, 62s-63s, 52s, 42s, 32s, A6o-A7o, A2o-A4o, K2o-K9o, Q2o-Q9o, J2o-J9o, T2o-T8o, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
99, 22-44, A8s-ATs, A3s, K2s-K3s, Q9s-QTs, Q7s, Q3s-Q4s, T7s, 96s-97s, 85s+, 74s-75s, 64s, 53s, 43s, A8o-AJo, KJo, QTo+
Always raise 6/9bb
JJ+, AQs+, KQs, T8s, AKo, JTo
Mixed
TT, 55-88, AJs, A4s-A7s, A2s, K4s-KJs, QJs, Q8s, Q5s-Q6s, J6s+, T9s, T6s, 98s, 76s, 65s, 54s, AQo, A5o, KQo, KTo, T9o
Settings: 4-max · 100bb · 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, 100bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.66). 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.