PokerSolver
PokerSolver/4-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BB vs CO 4-bet 13.8bb

BB vs CO 4-bet 13.8bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 100bb · CO opens 2bb, BB 3-bets to 6bb, CO 4-bets to 13.8bb · 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 20.94bbYour cards?
6bb
13.8bb
0.5bb

Tap your two cards.

Big blind's range

582 of 1,326 combos get here
Fold 75%Call 17.3%All-in 99.84bb 7.7%
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 2bb, BB 3-bets to 6bb, CO 4-bets to 13.8bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 100bb?

CO opens 2bb, BB 3-bets to 6bb, CO 4-bets to 13.8bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 100bb: the big blind (BB) folds 75%, calls 17.3% and goes all-in 99.84bb 7.7%. Always call: JJ, 99, 55-66, AQs. Always all-in 99.84bb: KK. Mixed: AA, QQ, TT, 77-88, 44, AKs, A2s-AJs, KQs, KTs, QJs, Q8s, J8s+, T9s, T7s, 97s+, 86s+, 75s+, 64s+, 53s, 42s, AQo+.

Always fold
KJs, K4s-K9s, K2s, Q9s-QTs, Q4s-Q7s, J4s-J7s, T8s, T5s, 84s-85s, 63s, 54s, 43s, 32s, AJo, A6o, A4o, KTo-KJo, QJo, J9o+, T8o+, 65o
Always call
JJ, 99, 55-66, AQs
Always all-in 99.84bb
KK
Mixed
AA, QQ, TT, 77-88, 44, AKs, A2s-AJs, KQs, KTs, QJs, Q8s, J8s+, T9s, T7s, 97s+, 86s+, 75s+, 64s+, 53s, 42s, AQo+
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.