CO 200bb Defense

Concept

CO 200bb Defense specifically refers to the defensive strategy for a player in the CO position when facing an open raise from an early position (UTG, UTG+1, etc.) or middle position (MP) with a stack depth of approximately 200 big blinds (bb). This depth falls into the "moderate-to-deep stack" category, often leading to postflop pot control and multi-street betting decisions, with relatively low ICM pressure (non-final table situations).

Core Principles

• Defensive Range: Typically includes strong hands (JJ+, AK) for 3-bets, medium-strength hands (TT-77, AQ, AJs, KQs, etc.) for calls, and some suited connectors (e.g., JTs, T9s) for balance. At 200bb, the calling frequency should be higher than at 100bb due to better implied odds.
• Postflop Strategy: Avoid playing large pots with marginal hands out of position; medium pairs can defend multiple streets on dry boards; flush draws or gutshot straight draws can be used for semi-bluff raises when appropriate.
• Adjustment Factors: Against tight-aggressive opponents (VPIP < 20), narrow the defensive range; against loose-aggressive opponents, widen it to include ATo, KJo, etc. The CO position has a positional disadvantage compared to the BTN but is still better than early positions, so the defensive range is wider than that of early positions.

Example

Typical defensive range (facing a 3bb open from MP):

• 3-bet: QQ+, AK (value); AQs, KQo (semi-bluff)
• Call: JJ-77, AQo, AJs, KJs, QJs, JTs, T9s, 98s
• Fold: AJo, KQo, small pairs (66-22), and weak suited connectors

Notes

• At 200bb depth, the probability of flopping top pair after calling is about 1/3; pot control requires caution.
• Avoid over-defending, which can lead to difficulty handling large pots postflop, especially against continuation bets.
• Leverage positional advantage: The CO acts last on the flop, allowing exploitation of opponents through bet sizing.