MDF= Pot Size / (Pot Size + Bet Size)

Ex. 1/2 Cash game
Hero holds J♥ T♥
River ($100) T♠ 9♥ 3♠ 6♦ A♥
Villain bets $50
Villain is risking $50 to win $100

MDF= 1-($50/($100+$50))=.67 or 67%

There is $150 in pot, we have to call $50 or 1/3

What this means is that if he were bluffing this bet would have to induce a fold at least 33% of the time to be profitable. We have to call about 1/3 times or more to prevent our opponent from exploitatively bluffing.

The above is a generic example, because Im fuzzy on the details. The hands in question:
Qs10s - Flopped Top pair + flush draw
Board ran out & completed straight with few combos. I fired three barrels, villain check shoved river, 100 into 150
I held second pair to a K, with spades.
Qs10s is certainly in the top of my range and may have warranted a call.
Villain showed As9s for bottom pair + flush draw

The other I held A8 suited flopped bottom pair + flush draw
Villain check raised turn > river shove
Showed J8o for bottom pair + turned open ender & worse 8

I folded both spots.

My question is how do I apply this to my range. What portion of my range do I continue with?

Is the calculation 100%-67%=33%

Thus I continue with the top 33% of my range (combos) to avoid being exploited? This seems a bit wide imo.

Playing mostly TAG the other night live in 1/2 noticed smart regs looking to exploit me as such in marginal spots. There were a few hands where using MDF correctly would have been beneficial. I understand the frequency portion but not range.

Thnx

The profitable portion.

If villain is risking 1 to win 2 then he needs to be getting folds 33% of the time, meaning you must not call less than 67% of the time. You call with the best hands possible and/or the best blocking hands.

If that seems wide then it is because people generally don't bluff that often in live games and using MDF is suicidal. Use it if you have no idea how someone is playing. If you simply don't have enough hands to call with then look to earlier streets and see if you can play them differently. Some people cbet all their hands with showdown value with some bluffs and when they check they literally cannot call anything.

As kelvis said, exploitative reads can be more helpful at live 1/2, use this type of theoretical approach when you don't know much about the villain or the game.

If villain is playing "correctly" then he is bluffing a percentage of his hands that it makes you indifferent to calling and folding. Your expected payoff would be the same in either situation. If he is bluffing too much, you call more often. If he is not bluffing enough, you call less often.

If you get to a point in your hand where you say to yourself that you want to call with 67% of your range, then you think about what hands do you have that get to this spot as played. Then you can think about your obvious folds (completely whiffed draws, etc.), obvious calls and work down from there. Thinking about what hands you have in your range that get to that spot is a really important aspect. it helps to explain how in some spots you can shrug call a pair of 5s on the river and in other spots you have to fold a straight/set on the river.

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