MP 100bb Defense

Overview

MP 100bb Defense refers to the strategy of responding to a raise from a later position (such as the cutoff or button) when you are in the middle position (MP) and both players have stacks of approximately 100 big blinds. This situation is common in cash games and early stages of tournaments. The goal is to either call (flat) or 3-bet (re-raise) to counter the initial raiser's aggression while controlling the pot size and range.

Key Considerations

Stack Depth

At 100bb, you have enough chips to apply pressure via 3-bets and also call with implied odds for speculative hands. However, you are also deep enough that mistakes can be costly. Position post-flop matters significantly: if you call, you will be out of position against the raiser (who is in a later seat). Therefore, your defense range should be tighter and more playable post-flop than if you were in position.

Ranges

Typical MP flatting ranges vs. a late-position open include medium-strength hands like suited connectors (e.g., 87s, 65s), suited aces (A2s–A5s), and some broadways (KJs, QTs). Stronger hands (TT+, AQ+) are often 3-bet for value. Hands like KTo, QJo, and small pocket pairs (22–66) are usually folded because they play poorly out of position or have limited implied odds.

3-Bet Defense

You can also defend by 3-betting. A standard 3-bet size is 3–4 times the initial raise plus additional for callers. Your 3-bet range should include value hands (JJ+, AK) and some bluffs (A5s, KQo, suited connectors). Avoid 3-betting hands that dominate your opponent's calling range but are easily dominated if re-raised.

Adjustments

• Against a tight open from the cutoff/button, you can defend more cautiously (fold more).
• Against a loose raiser, you can widen your calling and 3-betting ranges, especially with hands that flop well.
• If the initial raiser is aggressive post-flop, consider 3-betting more to take control.

Example Hands

• Call: MP opens to 3bb, CO raises to 9bb. You have 98s on the button? No, here you are MP. Example: MP (you) open? Actually, defense means you are responding to a raise. So: CO opens 3bb, you are in MP with A♠5♠. You call (defend) because it has playability and can flop draws.
• 3-bet: CO opens 3bb, MP (you) with TT 3-bet to 11bb for value and to isolate.

Common Mistakes

• Calling too wide: Hands like K9o or A8o are often -EV out of position.
• Folding too much: Especially against aggressive players who notice and exploit your passivity.
• Over-3-betting: Using too many bluffs can lead to getting re-bluffed or called by stronger ranges.

Conclusion

MP 100bb Defense is a nuanced aspect of cash game strategy. It requires balancing your range, understanding positional disadvantage, and adjusting to opponent tendencies. A solid default is to call with speculative hands and 3-bet with value and balanced bluffs.