PokerSolver
PokerSolver/4-max · 200bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BB vs CO 4-bet 17.25bb

BB vs CO 4-bet 17.25bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 200bb · CO opens 2.5bb, BB 3-bets to 7.5bb, CO 4-bets to 17.25bb · Big blind to act

4-max · 200bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 25.89bbYour cards?
7.5bb
17.25bb
0.5bb

Tap your two cards.

Big blind's range

422 of 1,326 combos get here
Fold 61.1%Call 30%Raise 37.95bb 8.7%All-in 199.84bb 0.2%
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 7.5bb, CO 4-bets to 17.25bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 200bb?

CO opens 2.5bb, BB 3-bets to 7.5bb, CO 4-bets to 17.25bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 200bb: the big blind (BB) folds 61.1%, calls 30%, raises 37.95bb 8.7% and goes all-in 199.84bb 0.2%. Always call: TT, 33-66, AQs, JTs, 87s, 76s, 65s. Always raise 37.95bb: AA. Mixed: JJ-KK, 77-99, AKs, A3s-AJs, KTs+, QTs+, T9s, 97s+, 86s, 75s, 53s+, AKo.

Always fold
A2s, K4s-K9s, Q6s-Q9s, Q4s, J7s-J9s, T6s-T8s, 74s, 63s, 43s, AQo, A7o, KJo+, QJo, JTo
Always call
TT, 33-66, AQs, JTs, 87s, 76s, 65s
Always raise 37.95bb
AA
Always all-in 199.84bb
No hand plays this every time
Mixed
JJ-KK, 77-99, AKs, A3s-AJs, KTs+, QTs+, T9s, 97s+, 86s, 75s, 53s+, AKo
Settings: 4-max · 200bb · 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, 200bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.95). 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.