PokerSolver
PokerSolver/5-max · 200bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BB vs BTN iso raise 3bb

BB vs BTN iso raise 3bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 200bb · CO limps, BTN isolates to 3bb · Big blind to act

5-max · 200bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 6.3bbYour cards?
1bb
1bb
3bb
0.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 78.3%Call 17.2%Raise 6/9bb 4.5%
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, BTN isolates to 3bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 200bb?

CO limps, BTN isolates to 3bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 200bb: the big blind (BB) folds 78.3%, calls 17.2% and raises 6/9bb 4.5%. Always call: QQ, 33, A8s, A5s, J9s, T9s, 76s, ATo+, KQo, QJo. Always raise 6/9bb: AA. Mixed: KK, 44-JJ, 22, A9s+, A6s-A7s, A2s-A4s, K5s+, K3s, Q8s+, JTs, T7s-T8s, 96s+, 86s+, 75s, 64s+, 53s+, 43s, KJo, QTo.

Always fold
K4s, K2s, Q2s-Q7s, J2s-J8s, T2s-T6s, 92s-95s, 82s-85s, 72s-74s, 62s-63s, 52s, 42s, 32s, A2o-A9o, K2o-KTo, Q2o-Q9o, J2o+, T2o+, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
QQ, 33, A8s, A5s, J9s, T9s, 76s, ATo+, KQo, QJo
Always raise 6/9bb
AA
Mixed
KK, 44-JJ, 22, A9s+, A6s-A7s, A2s-A4s, K5s+, K3s, Q8s+, JTs, T7s-T8s, 96s+, 86s+, 75s, 64s+, 53s+, 43s, KJo, QTo
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.