100bb 3-Bet Jam
100bb 3-Bet Jam
A preflop strategy where a player with a 100 big blind effective stack 3-bets an open raise and then goes all-in (jams) after facing a 4-bet, typically used to apply pressure in cash games or tournaments.
Overview
The 100bb 3-bet jam is a preflop play in no-limit hold'em where a player, holding an effective stack of 100 big blinds (bb), 3-bets (re-raises) an opponent's open raise and then, if re-raised again (4-bet), moves all-in. This is a high-stakes maneuver often seen in cash games or deep-stack tournament play. The key element is the 100bb depth, which makes the jam significant enough to put the opponent's entire stack at risk while still allowing for fold equity.
When and Why to Use
This play is typically employed in late position or from the blinds against a loose aggressive (LAG) opener or someone who frequently 4-bets. The goal is to capitalize on hands that are strong but vulnerable to being outdrawn (e.g., AK, AQ, JJ) or as a semi-bluff with suited connectors (e.g., 87s) against a capped range. Because 100bb is a common stack size in many cash games, mastering this jam can be profitable.
Considerations
- Stack Depth: At 100bb, the jam is not too shallow (where you might just shove outright) nor too deep (where you would prefer to call or raise smaller). It forces the opponent to risk a large portion of their stack.
- Opponent Tendencies: Use this against opponents who 4-bet light or have a polarized 4-betting range. Against tight players, it’s less effective as they only 4-bet premium hands.
- Hand Selection: Strong hands like KK+ are straightforward jams; hands like AKs are good because they block AA/KK and have equity against most calling ranges. Suited connectors (e.g., 65s) can be used as bluffs if you have a read that the opponent folds often.
Risks and Balance
The 100bb 3-bet jam can be high variance. If called, you usually need to win a showdown. Overusing it leads to exploitation: observant opponents will adjust by calling wider or 4-betting more frequently. To maintain balance, you should mix in some calls or small 3-bets with hands that want to see a flop (e.g., small pairs). GTO (Game Theory Optimal) models suggest a balanced range at 100bb might include value jams and bluff jams in a ratio that makes opponents indifferent to calling or folding.
Example Scenario
You are in the small blind with 100bb. The button (an aggressive regular) opens to 2.5bb. You 3-bet to 9bb with AKs. The button 4-bets to 22bb. You jam all-in for 100bb total. The button now must decide whether to call with their 4-bet range (which could include bluffs like A5s or value like QQ+). If they fold, you win the pot. If they call, you have about 35-40% equity against a range of QQ+ and AK.
Conclusion
The 100bb 3-bet jam is a powerful tool for applying pressure and building pots preflop. Success depends on stack dynamics, opponent reads, and proper hand selection. Used judiciously, it can significantly boost win rates; overused, it becomes a leak.