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

BB vs CO 3-bet 4bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 100bb · CO limps, BB isolates to 2bb, CO 3-bets to 4bb · 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 7.14bbYour cards?
2bb
4bb
0.5bb

Tap your two cards.

Big blind's range

398 of 1,326 combos get here
Fold 39.5%Call 29.4%Raise 9.2bb 24%All-in 99.84bb 7.1%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the big blind (BB) when CO limps, BB isolates to 2bb, CO 3-bets to 4bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 100bb?

CO limps, BB isolates to 2bb, CO 3-bets to 4bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 100bb: the big blind (BB) folds 39.5%, calls 29.4%, raises 9.2bb 24% and goes all-in 99.84bb 7.1%. Always call: 99, 55. Mixed: TT+, 66-88, 33, AJs+, A7s-A9s, A3s-A5s, KTs+, K8s, K5s-K6s, K2s-K3s, QTs+, Q8s, J8s+, J4s, T8s+, T6s, 97s+, 86s, 76s, 54s, 52s, AKo, ATo, KTo, JTo.

Always fold
96s, 93s
Always call
99, 55
Always raise 9.2bb
No hand plays this every time
Always all-in 99.84bb
No hand plays this every time
Mixed
TT+, 66-88, 33, AJs+, A7s-A9s, A3s-A5s, KTs+, K8s, K5s-K6s, K2s-K3s, QTs+, Q8s, J8s+, J4s, T8s+, T6s, 97s+, 86s, 76s, 54s, 52s, AKo, ATo, KTo, JTo
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.