65s vs a 4-betting range: Equity & Strategy

Six-Five Suited (65s) has 32.5% equity all-in preflop against a 4-betting range — 42 combos, 3.2% of all starting hands. It wins 32.2% of runouts outright, loses 67.3% and chops 0.6%. These are exact figures from full board enumeration against every unblocked combo in the range, not a simulation.

The range this is computed against

Four-betting is the tightest voluntary action in preflop poker. The standard construction is QQ+ and AK for value plus a token pair of blocker bluffs — A5s and A4s, which remove combos of AA and AK from the opponent's continuing range and still flop wheel and nut-flush draws when called. About 3% of hands.

4-bet — 42 combos, 3.2% of all starting hands: AA, KK, QQ, AKs, A5s, A4s, AKo

After card removal, 41 of those 42 combos are still available (1 are blocked by the cards 65s holds). 65s is ahead of 0 and behind 41.

Hardest parts of the range for 65s

Easiest parts of the range for 65s

Against a 4-betting range (42 combos, 3.2% of all hands), 65s runs at 32.5%. It wins 32.2% of runouts outright, loses 67.3% and splits the remaining 0.6%. Your own two cards remove 1 of those combos before the flop is even dealt — a blocker effect this number already accounts for, because every combo containing one of your exact cards is stripped out of the range first. There is not one combo in the range that 65s is a favourite against: all 41 live combos are in front of it. A range-average of 32.5% here is not an average of good spots and bad ones — every spot is a bad one.

Four-betting is the tightest voluntary action in preflop poker. The standard construction is QQ+ and AK for value plus a token pair of blocker bluffs — A5s and A4s, which remove combos of AA and AK from the opponent's continuing range and still flop wheel and nut-flush draws when called. About 3% of hands. Inside that range, the combos that hurt 65s most are AA (22.5%), KK (22.5%) and QQ (22.5%); the ones you want to see are A4s (43.3%), AKo (41.5%) and AKs (38.9%). Across the whole range 65s's equity swings from 22.5% at the bottom to 43.3% at the top — the single 32.5% headline is the combo-weighted average of all of it.

A 4-bet is the tightest action in preflop poker, and 32.5% reflects that: 65s is behind, and against a range this narrow the only sane options are 5-bet-jam with the right blockers or fold. There is no flat-and-outplay-them line against 3.2% of hands with the stacks a 4-bet creates.

65s vs 4-bet FAQ

What is 65s's equity against a 4-betting range?

65s has 32.5% equity all-in preflop against a 4-betting range — it wins 32.2% of runouts outright, loses 67.3% and chops 0.6%. The range holds 42 combos (3.2% of all hands); 65s blocks 1 of them, leaving 41 live. This is exact full board enumeration, not a simulation.

Which hands in a 4-betting range beat 65s?

All of them — 65s is behind every one of the 41 live combos. The worst are AA (22.5%), KK (22.5%) and QQ (22.5%), and the closest it gets is A4s (43.3%), AKo (41.5%) and AKs (38.9%). Every figure is exact, computed against that hand's unblocked combos only.

What hands are in a 4-betting range?

7 hand classes and 42 combos — 3.2% of the 1,326 possible starting hands. By combo count it is 43% pocket pairs (3 pairs, 18 combos), 29% suited hands (3 classes, 12 combos) and 29% offsuit hands (1 classes, 12 combos). That shape is why 65s runs at 32.5% against it rather than against a random hand.

Does 65s do better against a wider or a tighter range?

Wider, almost always. 65s has 39.4% equity against a loose-passive calling range (50.5% of hands) but 32.5% against a 4-betting range (3.2%). Equity against a range is mostly a question of how many weak hands the range still contains — which is why the same holding can be a monster against a button open and a fold against a 4-bet.

Run any hand vs range in the free equity calculator · All hand-vs-range matchups · 65s vs utg-open · 65s vs co-open · 65s vs btn-open · aa vs 4bet-range · kk vs 4bet-range · qq vs 4bet-range