PokerSolver
PokerSolver/5-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BTN vs CO open 2.5bb

BTN vs CO open 2.5bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 100bb · CO opens 2.5bb · Button to act

5-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 4.8bbYour cards?
0.5bb
1bb
2.5bb

Tap your two cards.

Button's range

1,326 of 1,326 combos get here
Fold 81.9%Call 1.8%Raise 5/7.5bb 16.3%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the button (BTN) when CO opens 2.5bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 100bb?

CO opens 2.5bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 100bb: the button (BTN) folds 81.9%, calls 1.8% and raises 5/7.5bb 16.3%. Always raise 5/7.5bb: TT+, 88, AJs+, A2s-A8s, KTs+, T9s, AQo+, ATo, KQo. Mixed: 99, 44-77, A9s-ATs, K7s-K9s, Q9s+, J8s+, 65s, 54s, AJo, KJo, QJo, JTo.

Always fold
22-33, K2s-K6s, Q2s-Q8s, J2s-J7s, T2s-T8s, 92s+, 82s+, 72s+, 62s-64s, 52s-53s, 42s+, 32s, A2o-A9o, K2o-KTo, Q2o-QTo, J2o-J9o, T2o+, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
No hand plays this every time
Always raise 5/7.5bb
TT+, 88, AJs+, A2s-A8s, KTs+, T9s, AQo+, ATo, KQo
Mixed
99, 44-77, A9s-ATs, K7s-K9s, Q9s+, J8s+, 65s, 54s, AJo, 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.