PokerSolver
PokerSolver/6-max · 40bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BB vs CO open 3bb

BB vs CO open 3bb

6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 40bb · CO opens 3bb · Big blind to act

6-max · 40bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 5.46bbYour cards?
1bb
3bb
0.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 62.5%Call 24.5%Raise 6/9bb 13%
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 6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 40bb?

CO opens 3bb in 6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 40bb: the big blind (BB) folds 62.5%, calls 24.5% and raises 6/9bb 13%. Always call: 22-66, A2s-ATs, K2s-KJs, Q4s+, J7s+, T7s+, 96s+, 85s+, 75s+, 64s+, 53s+, 43s, A9o, KQo, KTo. Always raise 6/9bb: 88+, AJs+, AQo+, A5o. Mixed: 77, KQs, Q2s-Q3s, J6s, J4s, T6s, 74s, ATo-AJo, A6o-A8o, A4o, KJo, K8o-K9o, Q9o+, J9o+, T8o+.

Always fold
J5s, J2s-J3s, T2s-T5s, 92s-95s, 82s-84s, 72s-73s, 62s-63s, 52s, 42s, 32s, A2o-A3o, K2o-K7o, Q2o-Q8o, J2o-J8o, T2o-T7o, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
22-66, A2s-ATs, K2s-KJs, Q4s+, J7s+, T7s+, 96s+, 85s+, 75s+, 64s+, 53s+, 43s, A9o, KQo, KTo
Always raise 6/9bb
88+, AJs+, AQo+, A5o
Mixed
77, KQs, Q2s-Q3s, J6s, J4s, T6s, 74s, ATo-AJo, A6o-A8o, A4o, KJo, K8o-K9o, Q9o+, J9o+, T8o+
Settings: 6-max · 40bb · 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, 40bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.93). 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.