PokerSolver
PokerSolver/Heads-up · 60bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bb/K4s

How to play K4s preflop

Heads-up · 60bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bb · 31 spots where K4s gets a decision

Opens (raise first in)

SpotK4s
SB open (RFI)
First to act
Raise 2/2.5/3bb 93.4% · Call 6.6%

Facing an open or a limp

SpotK4s
BB vs SB limp
SB limps
Call 82.2% · Raise 2/2.5/3bb 17.8%
BB vs SB open 2bb
SB opens 2bb
Raise 4/6bb 55.4% · Call 44.6%
BB vs SB open 2.5bb
SB opens 2.5bb
Call 100%
BB vs SB open 3bb
SB opens 3bb
Call 100%

Facing an isolation raise

SpotK4s
SB vs BB iso raise 2bb
SB limps, BB isolates to 2bb
Raise 4/6bb 76.1% · Call 23.9%
SB vs BB iso raise 2.5bb
SB limps, BB isolates to 2.5bb
Call 100%
SB vs BB iso raise 3bb
SB limps, BB isolates to 3bb
Call 99.6% · Raise 6/9bb 0.4%

Facing a 3-bet

SpotK4s
BB vs SB 3-bet 4bb
SB limps, BB isolates to 2bb, SB 3-bets to 4bb
Call 67% · Raise 9.2bb 24.7% · Fold 8.2% · All-in 59.84bb 0.2%
BB vs SB 3-bet 6bb
SB limps, BB isolates to 2bb, SB 3-bets to 6bb
Fold 61.6% · Raise 13.8bb 18.5% · All-in 59.84bb 10.3% · Call 9.6%
BB vs SB 3-bet 5bb
SB limps, BB isolates to 2.5bb, SB 3-bets to 5bb
All-in 59.84bb 79.7% · Call 17.6% · Fold 1.6% · Raise 11.5bb 1.1%
BB vs SB 3-bet 7.5bb
SB limps, BB isolates to 2.5bb, SB 3-bets to 7.5bb
Call 47.9% · Fold 43% · Raise 17.25bb 5.6% · All-in 59.84bb 3.5%
BB vs SB 3-bet 6bb
SB limps, BB isolates to 3bb, SB 3-bets to 6bb
Fold 54.5% · Call 35.8% · All-in 59.84bb 9.7%
BB vs SB 3-bet 9bb
SB limps, BB isolates to 3bb, SB 3-bets to 9bb
Fold 56.9% · Call 29.1% · All-in 59.84bb 8.7% · Raise 20.7bb 5.4%
SB vs BB 3-bet 4bb
SB opens 2bb, BB 3-bets to 4bb
Call 99.8% · Fold 0.1% · All-in 59.84bb 0.1%
SB vs BB 3-bet 6bb
SB opens 2bb, BB 3-bets to 6bb
Call 100%
SB vs BB 3-bet 5bb
SB opens 2.5bb, BB 3-bets to 5bb
Call 68.3% · Raise 11.5bb 31% · All-in 59.84bb 0.7%
SB vs BB 3-bet 7.5bb
SB opens 2.5bb, BB 3-bets to 7.5bb
Call 100%
SB vs BB 3-bet 6bb
SB opens 3bb, BB 3-bets to 6bb
Call 99.9% · Fold 0.1%
SB vs BB 3-bet 9bb
SB opens 3bb, BB 3-bets to 9bb
Call 100%

Facing a 4-bet

SpotK4s
SB vs BB 4-bet 9.2bb
SB limps, BB isolates to 2bb, SB 3-bets to 4bb, BB 4-bets to 9.2bb
Call 98.1% · Fold 1.4% · All-in 59.84bb 0.5%
SB vs BB all-in
SB limps, BB isolates to 2bb, SB 3-bets to 4bb, BB goes all-in
Fold 99.8% · Call 0.2%
BB vs SB 4-bet 9.2bb
SB opens 2bb, BB 3-bets to 4bb, SB 4-bets to 9.2bb
Fold 62.6% · Call 37.4%
BB vs SB all-in
SB opens 2bb, BB 3-bets to 4bb, SB goes all-in
Fold 100%
BB vs SB 4-bet 13.8bb
SB opens 2bb, BB 3-bets to 6bb, SB 4-bets to 13.8bb
Fold 96.2% · Call 3% · All-in 59.84bb 0.9%
BB vs SB all-in
SB opens 2bb, BB 3-bets to 6bb, SB goes all-in
Fold 99.8% · Call 0.2%

Facing a 5-bet or shove

SpotK4s
BB vs SB all-in
SB limps, BB isolates to 2bb, SB 3-bets to 4bb, BB 4-bets to 9.2bb, SB goes all-in
Fold 97.7% · Call 2.3%
BB vs SB all-in
SB limps, BB isolates to 2bb, SB 3-bets to 6bb, BB 4-bets to 13.8bb, SB goes all-in
Fold 96.3% · Call 3.7%
BB vs SB all-in
SB limps, BB isolates to 2.5bb, SB 3-bets to 7.5bb, BB 4-bets to 17.25bb, SB goes all-in
Fold 99.8% · Call 0.2%
BB vs SB all-in
SB limps, BB isolates to 3bb, SB 3-bets to 9bb, BB 4-bets to 20.7bb, SB goes all-in
Fold 86.2% · Call 13.8%
SB vs BB all-in
SB opens 2.5bb, BB 3-bets to 5bb, SB 4-bets to 11.5bb, BB goes all-in
Fold 99.9% · Call 0.1%
Settings: Heads-up · 60bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bb (small blind 0.5bb, big blind 1bb, an ante of 0.16bb from every player, 60bb stacks, 5% rake capped at 2bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 8.73). 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.