MP 100bb Open Jam

Overview

MP 100bb Open Jam is an aggressive strategy targeting a specific stack depth, typically seen in tournament mid-stages or cash games. MP refers to the middle position (usually UTG+1 in 6-max or UTG+2 and UTG+3 in 9-max), 100bb indicates an effective stack of approximately 100 big blinds, and Open Jam means shoving directly (All-in), rather than raising and then reacting to a re-raise.

Usage Scenarios

This play is primarily used in the following situations:

• Range Polarization: Holding strong hands (e.g., AA, KK) or weak hands with fold equity (e.g., Axs, small suited connectors), aiming to apply pressure with a large stack.
• Countering 3-bets: When raises from middle position frequently face 3-bets, open jamming can deny opponents the opportunity to 3-bet, especially when opponents have a high fold rate against 100bb shoves.
• ICM Pressure: Near the money bubble or final table in tournaments, as the value of the big blind increases, open jamming can force short stacks into difficult decisions.

Principles and Risks

The core of MP 100bb Open Jam is leveraging stack depth (around 100bb) to create a massive risk-reward ratio: opponents need to invest about 100bb to contest a pot of roughly 101.5bb, yet most starting hands have less than 50% equity against a random shoving range. However, this play is quite extreme; if opponents hold strong hands or have a wide calling range, it can result in significant chip loss. In typical examples, when opponents call with big pairs or high cards, the shover's range, if weak, is clearly -EV.

Notes

• Avoid using this play frequently, as opponents will adjust their calling range.
• Accurately assess opponents' fold tendencies and your own pot odds.
• Its effectiveness diminishes in deep stack situations (>150bb), as opponents' calling range becomes tighter after a shove.