๐ MDF (Minimum Defense Frequency)
What is MDF?
The minimum call frequency needed to make an opponent's bluff break even. MDF = Pot Size รท (Pot Size + Bet Size)
| Bet Size (% pot) | MDF | Meaning |
|---|---|---|
| 25% (1/4 pot) | 80% | Call 80%+ or bluffs become profitable for villain |
| 33% (1/3 pot) | 75% | โ |
| 50% (1/2 pot) | 67% | โ |
| 66% (2/3 pot) | 60% | โ |
| 75% (3/4 pot) | 57% | โ |
| 100% (pot) | 50% | Call 50%+ or bluffs become profitable |
| 150% (1.5x pot) | 40% | โ |
Exploit Adjustment
MDF is a GTO theoretical baseline. If opponent over-bluffs, call more frequently than MDF. If opponent is value-heavy (rarely bluffs), fold more frequently than MDF.
๐ฏ Countering Over-Bluffers
How to Identify Over-Bluffers
- AF (Aggression Factor) of 5+
- Low W$SD (under 45%) despite high WTSD
- High river bet frequency but negative winnings
- Has shown multiple bluffs at showdown
Counters vs Over-Bluffers
- Increase call-down frequency
- Call medium hands more often than MDF
- Check-call to trap
- Slow-play to let them keep bluffing
- Limit raises (they'll fold)
What NOT to Do
- Folding and letting their bluffs succeed
- Raising strong hands to fold them out
- Excessive check-raise bluffing yourself
๐ก๏ธ Countering Value-Heavy Players
How to Identify Value-Heavy Players
- Low river bet frequency (only bets value carefully)
- W$SD of 55%+ (high showdown win rate)
- Nit-like playing style
- Rarely shows bluffs at showdown
Counters vs Value-Heavy Players
- Call less than MDF (more folding is fine)
- Fold aggressively to raises
- Your bluffs have high EV (they fold often)
- Their river value bets: call only with near-nuts
๐งฑ Blockers in Bluff-Catching Decisions
Blockers are cards you hold that reduce the combinations of strong hands your opponent can have, narrowing their value range.
| Your Card | Blocking Effect | Impact on Bluff Catch |
|---|---|---|
| Aโ (nut flush board) | Blocks opponent's nut flush | Fewer value combos โ call more easily |
| K (KK board) | Blocks opponent's trip kings | Fewer nuts โ lean toward calling |
| T (JT9 board) | Blocks opponent's straights | Fewer value combos โ lean toward calling |
| Reverse blocker (8 on AA8 board) | "Gives" opponent weak hands | Opponent bluffs more โ consider calling |
๐ River Bluff-Catch Decision Flow
River Call Decision Steps
- Calculate pot odds: Amount to call รท (pot + call amount) = required equity
- Estimate opponent's betting range: Consider the ratio of value hands to bluffs
- Identify player type: Over-bluffer โ call more. Value-heavy โ fold more
- Check blockers: Does your hand block their value range?
- Decide: If your equity > required equity โ call