BB 100bb Open Jam
BB 100bb Open Jam
A preflop all-in (jam) made by the player in the big blind position when holding a stack of exactly 100 big blinds, typically after all previous players have folded.
The term "BB 100bb Open Jam" describes a specific preflop action where the player in the big blind (BB) voluntarily moves all-in for 100 big blinds (bb) before any postflop action, usually when the action folds around to them. This play is notable because the big blind is the last to act preflop and already has a blind posted, so an open jam from this position is an aggressive, all-or-nothing move.
Context and Usage
In cash games or tournaments, a player with a 100bb stack is considered deep-stacked. An "open jam" implies that no other player has raised before the big blind's turn; the big blind is effectively opening the action by going all-in. This is distinct from a "raise" or a "shove over a raise." The term is often used in strategy discussions to analyze the effectiveness of such a move at different stack depths.
Strategic Considerations
Hand Strength
Open jamming 100bb from the big blind is typically reserved for very strong hands (e.g., AA, KK, AKs) or as a balanced play with a polarized range. Because it risks a large stack to win only the blinds and antes (e.g., 1.5bb to 3bb), it is not a profitable default strategy. Opponents will fold weaker hands, so the jam needs to be strong enough to be called profitably, or the big blind must have a good read that opponents are folding too often.
Stack Depth
At 100bb, the effective stack is deep, making a jam less common. Jamming is more typical at shorter stacks (e.g., <20bb) where fold equity is higher and the risk-reward ratio improves. However, a 100bb jam can be used exploitatively against tight opponents who overfold to big bets, or as a metagame play to create fear.
Game Type
In tournaments, where ICM considerations matter, jamming 100bb is extremely rare due to the high risk of busting. In cash games, where players can reload, it is more plausible but still unconventional. Some aggressive players might use it with a balanced range that includes both value and bluffs (e.g., A5s) to remain unexploitable.
Example
In a 6-max cash game with blinds $1/$2, it folds to the big blind holding KK. The big blind, with a $200 stack (100bb), open jams all-in. The small blind folds, and the button calls with AA, winning the pot. This illustrates the risk of jamming deep: only a stronger hand calls, making the play suboptimal against a rational opponent.
Alternatives
Instead of jamming, the big blind could raise to a normal size (e.g., 3-4bb) to extract value or control pot size. A 100bb open jam is a polarized, high-variance play that should be used sparingly and with clear reasoning.
Summary
"BB 100bb Open Jam" is a descriptive term for an all-in raise from the big blind with a deep stack. It is a niche strategy that departs from standard preflop play and is most often justified by specific opponent tendencies or as part of a balanced range.