100bb Defense

What is 100bb Defense?

100bb Defense refers to the strategic approach of playing against a raise when the effective stack size is around 100 big blinds (bb). This depth is common in cash games and requires adjustments to standard short-stack strategies, as implied odds and post-flop maneuvering become more significant.

Why 100bb Depth Matters

At 100bb effective stacks, the pot-to-stack ratio allows for more complex post-flop play. Players can afford to call raises with hands that have high implied odds, such as suited connectors and small pairs, because they can win large pots if they hit strong hands. Conversely, the risk of being outplayed post-flop increases, making position and hand selection crucial.

Key Principles

• Defending the Big Blind: When facing an open-raise from late position, the big blind (BB) can defend with a wider range than at shorter stacks. Common defending ranges include all suited connectors, all pairs, suited aces, and some offsuit broadway hands. The BB should avoid defending too passively and mix in 3-bets.
• In Position Defense: When on the button or cutoff, defending against a raise involves a mix of calling and 3-betting. Deep stacks favor skillful post-flop players, so those with a positional advantage can call more often.
• Implied Odds: Hands that rely on hidden strength (e.g., 65s) gain value at 100bb because they can stack opponents who overplay overpairs or top pairs.

Example Ranges

A typical Big Blind defending range against a 3x button open at 100bb might include:

• All pocket pairs (22-AA)
• Suited aces (A2s-A5s for implied odds, A9s+ for value)
• Suited connectors (54s+), one-gappers (75s+, 86s+)
• Some offsuit broadway (ATo, KJo, QJo) This range is wider than at 50bb where tight play is preferred.

Post-Flop Play

• Floating and Delayed Bluffs: Deep stacks allow for more floating (calling flop bets to bluff later) because opponents may be cautious with marginal hands.
• Stacking Off: Be cautious committing large portions of the stack with one-pair hands. The nut advantage matters more; for example, sets or straights are more likely to be present.
• Bet Sizing: Larger bets (e.g., 2/3 pot or more) are common on later streets to build pots for value, but sizing should be adjusted based on board texture and opponent tendencies.

Common Mistakes

• Overdefending: Calling with trash hands like K2o out of position leads to frequent difficult decisions and negative EV.
• Underdefending: Folding too many hands like 76s or 22 allows opponents to profitably steal blinds with a wide range.
• Poor Post-Flop Play: Not adjusting bet sizing or failing to detect opponent range imbalances can negate the benefits of a wider preflop range.

Conclusion

100bb Defense is a nuanced skill that balances preflop aggression, hand selection, and post-flop execution. Mastering it requires understanding implied odds, positional dynamics, and opponent tendencies.