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

BB vs CO 3-bet 4bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 100bb · CO limps, BB isolates to 2bb, CO 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 7.3bbYour cards?
2bb
4bb
0.5bb

Tap your two cards.

Big blind's range

362 of 1,326 combos get here
Fold 23.8%Call 43.8%Raise 9.2bb 25.7%All-in 99.84bb 6.7%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the big blind (BB) when CO limps, BB isolates to 2bb, CO 3-bets to 4bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 100bb?

CO limps, BB isolates to 2bb, CO 3-bets to 4bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 100bb: the big blind (BB) folds 23.8%, calls 43.8%, raises 9.2bb 25.7% and goes all-in 99.84bb 6.7%. Always call: JJ, 66-77, AQs, KJs. Always raise 9.2bb: AA. Mixed: QQ-KK, 88-99, 33-55, AKs, A8s-AJs, A3s-A6s, KQs, KTs, K6s-K8s, Q9s+, J8s+, J4s, T6s+, T3s, 98s, 75s+, 64s+, 53s+, AQo+, A9o, KJo, QJo, JTo.

Always fold
No hand plays this every time
Always call
JJ, 66-77, AQs, KJs
Always raise 9.2bb
AA
Always all-in 99.84bb
No hand plays this every time
Mixed
QQ-KK, 88-99, 33-55, AKs, A8s-AJs, A3s-A6s, KQs, KTs, K6s-K8s, Q9s+, J8s+, J4s, T6s+, T3s, 98s, 75s+, 64s+, 53s+, AQo+, A9o, KJo, QJo, JTo
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.