CO 15bb 3-Bet Jam

Overview

The "CO 15bb 3-Bet Jam" is a common tournament and cash game play where a player in the cutoff (CO) position, holding a stack of around 15 big blinds (bb), shoves all-in as a 3-bet after an opponent has opened the pot. This move is part of a broader push/fold strategy often employed at shorter stack depths, but here it specifically targets situations where the opener is likely to have a wide range and may fold to a large all-in.

Why 15bb and CO?

At 15bb, the stack is too large for a standard open-shove (which is more common below 10bb) but too small for a standard raise to 3x or 4x, as that would commit too much of the stack and leave awkward post-flop options. The cutoff is a stealing position, and opponents on the button or in the blinds often open light. A 3-bet jam from CO exploits this by denying the opener the chance to see a flop and forcing them to make a decision for their entire stack.

Key Considerations

• Fold Equity: The success of the play hinges on the opener folding often enough. Against a very wide open range (e.g., from button), a 15bb jam can show immediate profit even with weak hands.
• Range Construction: Typically, hands that play well against calling ranges (e.g., Ax, broadway, small pairs) are preferred. Hands like low suited connectors may be less effective because they rely more on fold equity.
• Blind Defense: The big blind may also overcall or squeeze, but with 15bb, the jam is usually only against the initial raiser; if blinds call, the situation becomes multiway with a short stack, which can be problematic.
• ICM (Tournament): In tournaments, ICM pressure can make this play even more profitable, as opponents may fold hands that are mathematically correct calls in cash games.

Typical Example

In a 9-handed tournament, blinds are 500/1000 with a 100 ante. The cutoff (Hero) has 15,000 chips (15bb). The button opens to 2,500. Hero looks down at A♠9♠ and shoves all-in for 15,000. The button folds. Hero wins the blinds, ante, and the raise without showdown. Note: This is an example; actual ranges depend on opponent tendencies.

Risks

If the opponent calls with a strong range (e.g., TT+, AQ+), Hero's hand often has poor equity. Overusing this strategy can be exploited by observant opponents who call wider. Also, with 15bb, a standard 3-bet to around 7-8bb and a flop shove can be an alternative, though that gives the opponent a chance to see a flop.

Conclusion

The CO 15bb 3-Bet Jam is a powerful tool in a short-stacked arsenal, leveraging position and stack size to generate folds. It is most effective when the opener is aggressive and folds too much, but it requires careful hand selection and awareness of table dynamics.