Minimum defense frequency (MDF) and pot odds are two important concepts to master if you want to strengthen your poker strategy.

When faced with a bet in poker, you can react in several ways: call, fold, bet, or raise. It’s usually apparent when it’s time to bet or raise; super strong hands want to extract value, while your bluffs are an effort to steal the pot. Whether to call or fold, on the other hand, is often not so clear, and this is where MDF and pot odds are helpful.

Read on for a more comprehensive explanation of these two concepts, which are often showcased in poker tournaments by the best players in the poker world.

Defining Minimum Defense Frequency

Poker minimum defense frequency is the minimum percentage of hands you must not fold to a bet to prevent the aggressor from profiting by always bluffing you. If your folding frequency is more than what the MDF indicates, your opponent can exploit you by over-bluffing when they bet.

If you want to play higher-stakes poker and face very tough competition or take part in poker tournaments, you’ll need to understand the MDF poker defense strategy and practice this concept. Understanding everything from MDF to range balancing in poker will help ensure you don’t get exploited by the best players in the game.

Defining Pot Odds

MDF has a very important place in poker strategy. But you may ask, is MDF important for beginner poker players? Not for the casual player trying to master starting strategies, but it’s important when you advance to higher stakes or when you’re up against strong players in heads-up poker. 

A better starting point for beginners and a generally much simpler way to play when facing bets is to start by understanding pot odds in poker. You can look at your pot odds, estimate your opponent’s range, and make a decision on whether your hand has enough equity to call against that range.

Simply put, pot odds poker requires calculating a ratio by comparing the size of the pot to the size of the call you’ll have to make to try to win the pot. (If there is $100 in the pot, and you must call $50 to stay in the hand, the odds are 2:1.) So, instead of having to figure out your MDF and playing a mixed strategy with various hands, you can simply always fold or always call with hands that do or don’t have enough equity when facing a bet.

When to Use Minimum Defense Frequency 

When should you use minimum defense frequency? Suppose that there are 100 chips in the pot, and the aggressor bets 100. How often should you call?

MDF approaches this question from the aggressor’s perspective, not from the angle of an exploitative poker strategy. They are betting 100 to potentially win the 100 in the pot, giving them ±100 odds, even if their hand has zero equity (i.e., no chance of beating your hand). Then, if you, the hero, fold more than 50% of the time, the aggressor comes out ahead. 

In a heads-up battle, the hero needs to call (or raise, but not fold) at least 50% of the time. The hero can spin a coin or, preferably, choose the best 50% of hands in their perceived range at that point to continue with, regardless of what the aggressor holds.

When to Use Pot Odds

Pot odds poker, on the other hand, approaches the same scenario from the hero’s perspective. There is now 200 in the pot, and the hero needs to put in 100 to call. 

You are getting +200 odds and need to win 33% of the time to break even. Therefore, you need to compare your hand with the perceived average hand strength (range) of the aggressor. 

Will you win 33% of the time? With pot odds, you’re considering what the aggressor holds, as opposed to the minimum defense frequency in poker, which focuses on your holding.

How to Calculate MDF

How do you calculate MDF in poker? It’s relatively simple if you use the formula in this poker cheat sheet or an MDF calculator:

MDF = pot size / (pot size + bet size).

For example:

MDF = 100 / (100+50)

MDF = 100 / 150

MDF = 0.67

To get your MDF percentage, all you need to do is multiply this number by 100. In this case, you should play 67% of your range, which is always the case when facing a half-pot bet.

Once you calculate your poker MDF, similar to working with hand range balancing, you’ll work with a solver to determine which hands fall into that 67% category and which hands would be best to call when facing this bet.

How to Calculate Pot Odds 

In order to calculate your pot odds in poker, you will use the following formula:

Pot odds = call amount / total pot after you call

Pot odds = 50 / (100 + 50)

Pot odds = 50 / 150

Pot odds = 0.25

You will need to multiply this final number by 100 to get a percentage; in this case, it’s 25%. So, when facing a 50% pot-sized bet, you must have 25% equity against your opponent’s range to make the call profitable.

What that means is if your opponent is likely to bluff a lot, you should be more willing to call with weaker hands to see if they’re bluffing. If your opponent usually has strong hands, you should be careful about calling with weaker hands, as the chances of winning are slimmer.

When to Avoid Using MDF 

As mentioned, it’s important to know what the minimum defense frequency in poker is, though you will rarely use it. It’s vital that you’re able to adjust your poker strategy, look at things like MDF vs pot odds, and use what the hand requires. But there are situations where you should definitely avoid using MDF. 

1. Defending Against Bets on the Flop

When you defend the big blind, you’re often in a weaker position, and the player who bet first can take advantage of that.

2. When Opponents Cannot Have Natural Bluffs

Don’t try to remain unexploitable by bluffs when your opponent doesn’t have any obvious hands to bluff with, per most poker bluffing strategies.

3. When Playing Against Weak Opposition

Use an exploitative strategy, not an aggressive one, which can also mean folding more than usual when your opponent doesn’t bluff enough during certain moments in the game.

Practice your Poker Strategy with BetMGM  

When thinking about new concepts in poker, such as how MDF and pot odds work together, you should always consider the style and range of your opponent before making a decision. A great place to do this with the most hands per hour is online at a reputable and licensed site like BetMGM Poker. You can play poker with real money at BetMGM and even use an online poker welcome bonus to make the most of your first deposit.