PokerSolver
PokerSolver/5-max · 200bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BB vs CO 4-bet 11.5bb

BB vs CO 4-bet 11.5bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 200bb · CO opens 2.5bb, BB 3-bets to 5bb, CO 4-bets to 11.5bb · Big blind to act

5-max · 200bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 17.8bbYour cards?
5bb
11.5bb
0.5bb

Tap your two cards.

Big blind's range

204 of 1,326 combos get here
Fold 24.4%Call 63.1%Raise 25.3bb 11.9%All-in 199.84bb 0.7%
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 2.5bb, BB 3-bets to 5bb, CO 4-bets to 11.5bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 200bb?

CO opens 2.5bb, BB 3-bets to 5bb, CO 4-bets to 11.5bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 200bb: the big blind (BB) folds 24.4%, calls 63.1%, raises 25.3bb 11.9% and goes all-in 199.84bb 0.7%. Always call: JJ, 44-88, A9s-ATs, KQs, QTs, 54s. Mixed: QQ+, 99-TT, AKs, AJs, A7s, A4s-A5s, K9s-KJs, QJs, JTs, T9s, 76s, 64s+, AKo.

Always fold
JTo
Always call
JJ, 44-88, A9s-ATs, KQs, QTs, 54s
Always raise 25.3bb
No hand plays this every time
Always all-in 199.84bb
No hand plays this every time
Mixed
QQ+, 99-TT, AKs, AJs, A7s, A4s-A5s, K9s-KJs, QJs, JTs, T9s, 76s, 64s+, AKo
Settings: 5-max · 200bb · 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, 200bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.99). 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.