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Is something wrong with my math?

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Edukator99
Joined: 18.07.2010

I just learned about the "Cash Out" option on poker stars. This is what it is:
All-in Cash Out is a feature that gives eligible players who are all-in the option to collect the value of their hand without having to play the hand to its conclusion.

I was trying to figure out if it would make sense to just Cash out every time you are behind. Here's the hand I was playing.

Hero: QS QH
VILLIAN: AD 9H

BOARD: 10D 6D 3C 8S

I don't know why he called an all in here but, using equity I am 84% to win and so he is 16% to lose. He took the Cash out. Turn was a Ace. Bad for him but what about in the long run?

I worked out the math two ways and I get two different answers. Same situation with a $10 pot. Easy to calculate.

84% equity x 100 =$840 I should win, on average, $840 for every 100 times I'm an 84% favourite.

But if I calculate this way it's different. I win 84 hands at $10 a hand that's $840. But then I LOSE 16 hands at $10 a hand.
840
-160
780.

Why are the two answers different? If I play 100 hands of poker and I win, on average $8.40 I should have $840. Not $780...

What am I doing wrong with my EV calculation here?


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4 replies
Rhodriguez
Joined: 01.10.2006

Keep in mind that you also pay a fee for the "Cash Out" option (IIRC 1%).

You don't lose $10 in those 16 pots you just don't win (or lose) anything. Because you already payed your 5 bucks (if HU) to contribute to the pot. You only have to subtract your contribution before you call or raise. When facing up the cards the pot is dead money.


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tieppofer
Joined: 25.01.2009

The formula is (pot-rake)*equity*.99

Anyway, as for your question, your math is just wrong, you're calculating your losses twice.

But if I calculate this way it's different. I win 84 hands at $10 a hand that's $840. But then I LOSE 16 hands at $10 a hand.
840
-160
780.

Why are the two answers different? If I play 100 hands of poker and I win, on average $8.40 I should have $840. Not $780...

What am I doing wrong with my EV calculation here?

You are subtracting the 160 bucks from your winnings like a sequential series of events, that doesn't make much sense, if you win 840 and then loose 160 you have 780, but that's now how equity works, as it was said, the money is dead, losing means not winning.


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Edukator99
Joined: 18.07.2010

Right! Of course. I knew the 100 x 0.84 was giving me the correct answer but I forgot that I would win zero not lose $10 on the 16 I missed.

Of course, if calculating actual profit....

Every one of those 84 wins I put in $5 so I'd only profit half of the $840 so $420. Then I'd lose $5 on the 14 losses... so that's $70.

420 + 70 = 490.
$840 - 490 - $350. (minus whatever the rake would be).

I think that's right.


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