PokerSolver
PokerSolver/4-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BB vs BTN open 2.5bb

BB vs BTN open 2.5bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 100bb · BTN opens 2.5bb · 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 4.64bbYour cards?
1bb
2.5bb
0.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 42.8%Call 40%Raise 5/7.5bb 17.2%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the big blind (BB) when BTN opens 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 100bb?

BTN opens 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 100bb: the big blind (BB) folds 42.8%, calls 40% and raises 5/7.5bb 17.2%. Always call: 22-44, A8s-A9s, K6s, K2s-K3s, Q2s-Q8s, J2s-J4s, T2s-T5s, 96s, 94s, 86s, 74s-75s, 63s-64s, 52s, 42s+, A2o-A9o, K8o-K9o, K6o, Q8o-QTo, J8o-J9o, T8o, 98o, 76o. Always raise 5/7.5bb: TT+, 66-77, ATs+, A3s-A5s, KTs+, QTs+, JTs, T9s, 97s+, 76s, 54s, AQo+. Mixed: 88-99, 55, A6s-A7s, A2s, K7s-K9s, K4s-K5s, Q9s, J5s-J9s, T6s-T8s, 95s, 92s-93s, 87s, 84s-85s, 73s, 65s, 53s, ATo-AJo, KTo+, K7o, K5o, QJo, Q7o, JTo, T9o, T7o, 97o, 87o, 65o, 54o.

Always fold
82s-83s, 72s, 62s, 32s, K2o-K4o, Q2o-Q6o, J2o-J7o, T2o-T6o, 92o-96o, 82o-86o, 72o-75o, 62o-64o, 52o-53o, 42o+, 32o
Always call
22-44, A8s-A9s, K6s, K2s-K3s, Q2s-Q8s, J2s-J4s, T2s-T5s, 96s, 94s, 86s, 74s-75s, 63s-64s, 52s, 42s+, A2o-A9o, K8o-K9o, K6o, Q8o-QTo, J8o-J9o, T8o, 98o, 76o
Always raise 5/7.5bb
TT+, 66-77, ATs+, A3s-A5s, KTs+, QTs+, JTs, T9s, 97s+, 76s, 54s, AQo+
Mixed
88-99, 55, A6s-A7s, A2s, K7s-K9s, K4s-K5s, Q9s, J5s-J9s, T6s-T8s, 95s, 92s-93s, 87s, 84s-85s, 73s, 65s, 53s, ATo-AJo, KTo+, K7o, K5o, QJo, Q7o, JTo, T9o, T7o, 97o, 87o, 65o, 54o
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.