Poker Math: Every Decision is based on Pot Odds
This is a very important lesson and can
also be quite intimidating 💶 to a lot of people as we are going to discuss Poker Math!
But there is no need for you 💶 to be intimidated, Poker Maths is very simple and we will
show you a very simple method in this lesson. 💶 You won’t need to carry a calculator
around with you or perform any complex mathematical calculations.
What is Poker
Math?
As daunting 💶 as it sounds, it is simply a tool that we use during the decision
making process to calculate the Pot 💶 Odds in Poker and the chances of us winning the
pot.
Remember, Poker is not based on pure luck, it is 💶 a game of probabilities, there
are a certain number of cards in the deck and a certain probability that outcomes 💶 will
occur. So we can use this in our decision making process.
Every time we make a decision
in Poker it 💶 is a mathematical gamble, what we have to make sure is that we only take
the gamble when the odds 💶 are on in our favour. As long as we do this, in the long term
we will always come out 💶 on top.
When to Use Poker Maths
Poker Maths is mainly used when
we need to hit a card in order to 💶 make our hand into a winning hand, and we have to
decide whether it is worth carrying on and chasing 💶 that card.
To make this decision we
consider two elements:
How many “Outs” we have (Cards that will make us a winning 💶 hand)
and how likely it is that an Out will be dealt. What are our “Pot Odds” – How much
💶 money will we win in return for us taking the gamble that our Out will be dealt
We then
compare the 💶 likelihood of us hitting one of our Outs against the Pot Odds we are
getting for our bet and see 💶 if mathematically it is a good bet.
The best way to
understand and explain this is by using a hand walk 💶 through, looking at each element
individually first, then we’ll bring it all together in order to make a decision on
💶 whether we should call the bet.
Consider the following situation where you hold A 8 in
the big blind. Before the 💶 flop everyone folds round to the small blind who calls the
extra 5c, to make the Total pot before the 💶 Flop 20c (2 players x 10c). The flop comes
down K 9 4 and your opponent bets 10c. Let’s use 💶 Poker Math to make the decision on
whether to call or not.
Poker Outs
When we are counting the number of “Outs” 💶 we have,
we are looking at how many cards still remain in the deck that could come on the turn
💶 or river which we think will make our hand into the winning hand.
In our example hand
you have a flush 💶 draw needing only one more Club to make the Nut Flush (highest
possible). You also hold an overcard, meaning that 💶 if you pair your Ace then you would
beat anyone who has already hit a single pair on the flop.
From 💶 the looks of that flop
we can confidently assume that if you complete your Flush or Pair your Ace then 💶 you
will hold the leading hand. So how many cards are left in the deck that can turn our
hand 💶 into the leading hand?
Flush – There are a total of 13 clubs in the deck, of which
we can see 💶 4 clubs already (2 in our hand and 2 on the flop) that means there are a
further 9 club 💶 cards that we cannot see, so we have 9 Outs here.
– There are a total of
13 clubs in the 💶 deck, of which we can see 4 clubs already (2 in our hand and 2 on the
flop) that means 💶 there are a further 9 club cards that we cannot see, so we have 9 Outs
here. Ace Pair – 💶 There are 4 Ace’s in the deck of which we are holding one in our hand,
so that leaves a 💶 further 3 Aces that we haven’t seen yet, so this creates a further 3
Outs.
So we have 9 outs that 💶 will give us a flush and a further 3 outs that will give
us Top Pair, so we have a 💶 total of 12 outs that we think will give us the winning
hand.
So what is the likelihood of one of 💶 those 12 outs coming on the Turn or
River?
Professor’s Rule of 4 and 2
An easy and quick way to calculate 💶 this is by using
the Professor’s rule of 4 and 2. This way we can forget about complex calculations and
💶 quickly calculate the probability of hitting one of our outs.
The Professor’s Rule of 4
and 2 After the Flop (2 💶 cards still to come… Turn + River)
Probability we will hit our
Outs = Number of Outs x 4
Probability we will 💶 hit our Outs = Number of Outs x 4 After
the Turn (1 card to come.. River)
Probability we will hit 💶 our Outs – Number of Outs x
2
So after the flop we have 12 outs which using the Rule of 💶 4 and 2 we can calculate
very quickly that the probability of hitting one of our outs is 12 x 💶 4 = 48%. The exact
% actually works out to 46.7%, but the rule of 4 and 2 gives us 💶 a close enough answer
for the purposes we need it for.
If we don’t hit one of our Outs on the 💶 Turn then with
only the River left to come the probability that we will hit one of our 12 Outs 💶 drops
to 12 x 2 = 24% (again the exact % works out at 27.3%)
To compare this to the exact
💶 percentages lets take a look at our poker outs chart:
After the Flop (2 Cards to Come)
After the Turn (1 💶 Card to Come) Outs Rule of 4 Exact % Outs Rule of 2 Exact % 1 4 % 4.5
% 💶 1 2 % 2.3 % 2 8 % 8.8 % 2 4 % 4.5 % 3 12 % 13.0 % 💶 3 6 % 6.8 % 4 16 % 17.2 % 4 8 % 9.1
% 5 20 % 21.2 % 💶 5 10 % 11.4 % 6 24 % 25.2 % 6 12 % 13.6 % 7 28 % 29.0 % 💶 7 14 % 15.9 % 8
32 % 32.7 % 8 16 % 18.2 % 9 36 % 36.4 % 💶 9 18 % 20.5 % 10 40 % 39.9 % 10 20 % 22.7 % 11
44 % 43.3 % 💶 11 22 % 25.0 % 12 48 % 46.7 % 12 24 % 27.3 % 13 52 % 49.9 % 💶 13 26 % 29.5 %
14 56 % 53.0 % 14 28 % 31.8 % 15 60 % 56.1 % 💶 15 30 % 34.1 % 16 64 % 59.0 % 16 32 % 36.4
% 17 68 % 61.8 % 💶 17 34 % 38.6 %
As you can see the Rule of 4 and 2 does not give us the
exact 💶 %, but it is pretty close and a nice quick and easy way to do the math in your
head.
Now 💶 lets summarise what we have calculated so far:
We estimate that to win the
hand you have 12 Outs
We have calculated 💶 that after the flop with 2 cards still to come
there is approximately a 48% chance you will hit one 💶 of your outs.
Now we know the Odds
of us winning, we need to look at the return we will get 💶 for our gamble, or in other
words the Pot Odds.
Pot Odds
When we calculate the Pot Odds we are simply looking 💶 to
see how much money we will win in return for our bet. Again it’s a very simple
calculation…
Pot Odds 💶 Formula Pot Odds = Total Pot divided by the Bet I would have to
call
What are the pot odds after 💶 the flop with our opponent having bet 10c?
Total Pot =
20c + 10c bet = 30 cents
Total Bet I would 💶 have to make = 10 cents
Therefore the pot
odds are 30 cents divided by 10 cents or 3 to 1.
What 💶 does this mean? It means that in
order to break even we would need to win once for every 3 💶 times we lose. The amount we
would win would be the Total Pot + the bet we make = 30 💶 cents + 10 cents = 40
cents.
Bet number Outcome Stake Winnings 1 LOSE 10 cents Nil 2 LOSE 10 cents 💶 Nil 3 LOSE
10 cents Nil 4 WIN 10 cents 40 cents TOTAL BREAKEVEN 40 cents 40 cents
Break Even
Percentage
Now 💶 that we have worked out the Pot Odds we need to convert this into a
Break Even Percentage so that 💶 we can use it to make our decision. Again it’s another
simple calculation that you can do in your head.
Break 💶 Even Percentage Break Even
Percentage = 100% divided by (Pot odds added together)
Let me explain a bit further.
Pot Odds 💶 added together means replace the “to” with a plus sign eg: 3 to 1 becomes 3+1
= 4. So in 💶 the example above our pot odds are 3 to 1 so our Break Even Percentage =
100% divided by 4 💶 = 25%
Note – This only works if you express your pot odds against a
factor of 1 eg: “3 to 💶 1” or “5 to 1” etc. It will not work if you express the pot odds
as any other factor 💶 eg: 3 to 2 etc.
So… Should You call?
So lets bring the two elements
together in our example hand and see 💶 how we can use the new poker math techniques you
have learned to arrive at a decision of whether to 💶 continue in the hand or whether to
fold.
To do this we compare the percentage probability that we are going to 💶 hit one of
our Outs and win the hand, with the Break Even Percentage.
Should I Call? Call if……
Probability of 💶 Hitting an Out is greater than Pot Odds Break Even Percentage
Fold if……
Probability of Hitting an Out is less than 💶 Pot Odds Break Even Percentage
Our
calculations above were as follows:
Probability of Hitting an Out = 48%
Break Even
Percentage = 25%
If 💶 our Probability of hitting an out is higher than the Break Even
percentage then this represents a good bet – 💶 the odds are in our favour. Why? Because
what we are saying above is that we are going to get 💶 the winning hand 48% of the time,
yet in order to break even we only need to hit the winning 💶 hand 25% of the time, so
over the long run making this bet will be profitable because we will win 💶 the hand more
times that we need to in order to just break even.
Hand Walk Through #2
Lets look at
another 💶 hand example to see poker mathematics in action again.
Before the Flop:
Blinds:
5 cents / 10 cents
Your Position: Big Blind
Your Hand: 💶 K 10
10 Before Flop Action:
Everyone folds to the dealer who calls and the small blind calls, you check.
Two people
💶 have called and per the Starting hand chart you should just check here, so the Total
Pot before the flop 💶 = 30 cents.
Flop comes down Q J 6 and the Dealer bets 10c, the
small blind folds.
Do we call? Lets 💶 go through the thought process:
How has the Flop
helped my hand?
It hasn’t but we do have some draws as we 💶 have an open ended straight
draw (any Ace or 9 will give us a straight) We also have an overcard 💶 with the King.
How
has the Flop helped my opponent?
The Dealer did not raise before the flop so it is
unlikely 💶 he is holding a really strong hand. He may have limped in with high cards or
suited connectors. At this 💶 stage our best guess is to assume that he has hit top pair
and holds a pair of Queens. It’s 💶 possible that he hit 2 pair with Q J or he holds a
small pair like 6’s and now has 💶 a set, but we come to the conclusion that this is
unlikely.
How many Outs do we have?
So we conclude that 💶 we are facing top pair, in
which case we need to hit our straight or a King to make top 💶 pair to hold the winning
hand.
Open Ended Straight Draw = 8 Outs (4 Aces and 4 Nines)
King Top Pair = 💶 3 Outs (4
Kings less the King in our hand)
Total Outs = 11 Probability of Winning = 11 x 4 💶 =
44%
What are the Pot Odds?
Total Pot is now 40 cents and we are asked to call 10 cents
so 💶 our Pot odds are 4 to 1 and our break even % = 100% divided by 5 = 20%.
Decision
So
now 💶 we have quickly run the numbers it is clear that this is a good bet for us (44% vs
20%), 💶 and we make the call – Total Pot now equals 50 cents.
Turn Card
Turn Card = 3 and
our opponent makes 💶 a bet of 25 cents.
After the Turn Card
This card has not helped us
and it is unlikely that it has 💶 helped our opponent, so at this point we still estimate
that our opponent is still in the lead with top 💶 pair.
Outs
We still need to hit one of
our 11 Outs and now with only the River card to come our 💶 Probability of Winning has
reduced and is now = 11 x 2 = 22%
Pot Odds
The Total Pot is now 75 💶 cents and our Pot
odds are 75 divided by 25 = 3 to 1. This makes our Break Even percentage 💶 = 100% divided
by 4 = 25%
Decision
So now we have the situation where our probability of winning is
less than 💶 the break even percentage and so at this point we would fold, even though it
is a close call.
Summary
Well that 💶 was a very heavy lesson, but I hope you can see how
Poker Maths doesn’t have to be intimidating, and 💶 really they are just some simple
calculations that you can do in your head. The numbers never lie, and you 💶 can use them
to make decisions very easy in Poker.
You’ve learnt some important new skills and it’s
time to practise 💶 them and get back to the tables with the next stage of the Poker
Bankroll Challenge.
Poker Bankroll Challenge: Stage 3 💶 Stakes:R$0.02/$0.04
Buy In:R$3
(75 x BB)
Starting Bankroll:R$34
Target:R$9 (3 x Buy In)
Finishing
Bankroll:R$43
Estimated Sessions: 3 Use this exercise to start to consider 💶 your Outs
and Pot Odds in your decision making process, and add this tool to the other tools you
have 💶 already put into practice such as the starting hands chart.
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