Combinatorics and Probability Theory in Football Betting

Introduction to Combinatorics and Probability Theory

This article is a step-by-step guide explaining how to compute the probability that, for example, exactly 4 out of 6 picks win, or how to calculate the likelihood that at least 4 of 6 bets win.

To help your understanding of this topic you will need to comprehend the basics of football result probability calculations, which I explained in detail in the article Calculation of Odds: Probability and Deviation.

The Basics of Probability Computation in Football Betting

The following picks table contains 6 value bets including the calculated probabilities for each bet to win:

English Premier League - Value Bets - 22.3.2011

English Premier League - Example Picks 22.3.2011

Of the 6 published picks, 4 won and made a profit of 19.9% on the 50.00 € betting bank. I will now attempt to explain the mathematics behind the above selections.

The calculation of the probability that all 6 Picks will win is relatively easy and requires no knowledge of difficult formulas. You simply multiply together the given probabilities, thus:

61.1% x 63.2% x 77.0% x 56.4% x 52.6% x 71.0% = 6.3%

The result of 6.3% is the probability that all 6 picks in the portfolio win.

Of course, the other end of the scale is that all 6 picks will lose. Again, this is a straight forward calculation: simply multiply the opposing probabilities to those used in the ‘win’ scenario, thus:

38.9% x 36.8% x 23.0% x 43.6% x 47.4% x 29.0% = 0.1973%

The result of 0.1973% is the probability that all 6 picks lose.


  • Probability that all 6 Picks win: 6.3%
  • Probability that all 6 Picks lose: 0.1973%

If you divide 6.3% by 0.1973% the result is 31.93. This means the probability in this particular portfolio that all 6 picks win is almost 32 times higher than the probability that all 6 picks lose.

Practically speaking, there is a 32 times higher chance of winning all 6 bets and cashing 40.90 € profit than losing all 6 bets together with the entire 50.00 € starting bank.

Accumulated Betting Odds

  • To win all 6 picks: 15.9 (1 divided by 6.3%)
  • To lose all 6 picks: 506.7 (1 divided by 0.1973%)

These odds express that on average all 6 selected bets should win once in every 16 rounds and only once every 507th round should a total loss of the portfolio occur.

A single season’s football league betting will usually comprise approximately 80 rounds of matches (midweek and weekend betting). This means that statistically a total loss may happen once every 6.3 years betting on a similar portfolio to the example above each time. Of course, it could happen more often as wins and losses have a nasty habit of not lining up as cleanly as statistical theory says they should. For example, 2 total losses could occur in the first 2.6 years and then no more for another 10 years.

What is the probability that exactly ‘X’ picks win or lose?

Further interesting questions include what are the probabilities that exactly 5 of the selected 6 picks win, or at least 4 of the picks win, and following this, it is natural to ask whether it is viable to make long-term profit on this type of portfolio and if so, how much?

An easy starting point for assessing whether a portfolio is ‘worthwhile’ is by calculating the ‘expectancy’, in other words, how many of the picks are likely to win. This is simply the average of the win probabilities of the selected picks:

(61.1% + 63.2% + 77.0% + 56.4% + 52.6% + 71.0%) / 6 = 63.55%

This value means that by betting on the above portfolio a success rate of 63.55% is ‘expected’, which would correspond to a hit rate of 4 from 6 picks (i.e. 6 [picks] times 63.55% = 3.81 [roughly 4 picks]). This means that on average this portfolio should usually bring around 4 successful picks. However, it is obviously necessary to check if the combination of 4 successful picks and 2 failed ones will produce a profit:

Football Betting Profit Calculation - Permutation Any 4 from 6

Profit Calculation: Exactly 4 out of 6 Selections Win

The above illustration shows that every combination of 4 picks from our 6-match portfolio would have returned a profit of between 7.02 € and 16.71 € depending upon the combination.

Important Note

Please note that the average value (expectancy value) does not mean a 63.55% probability that exactly 4 picks will win every betting round. The average value indicates that if you bet on this type of 6-match portfolio often enough, an ‘average’ of 4 hits can be expected.

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Last Update: 17 April 2015

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49 Responses to “Combinatorics and Probability Theory in Football Betting”

  1. raymond
    3 January 2014 at 12:06 pm #

    Hi Soccerwidow,

    I have a question about 1×2 betting in soccer.
    Lets suppose there is a match between Team A and Team B.
    Lets suppose the average odds are 1.28 5.54 10.43
    And also lets suppose there are 100 games with these odds.
    Now if there is a payout of lets say 95% in this case does it from mathematical point of view mean that if I were to bet on any of the 3 outcomes 1 unit, then after all 100 games I would have lost 5 units? I mean if I bet 100 times on team A, 100 times on the draw and 100 times on Team B, does that 95% payout refer to all 3 outcomes equally or lets say for favorite there is more payout or the other way around?

    Thanks for answer.

    • Soccerwidow
      4 January 2014 at 1:52 pm #

      Hi Raymond,

      If I understand your question right you are assuming that the market odds represent the true probabilities of the outcome. If this would be so, then you could randomly bet on any outcome, and after thousand of matches only lose the overround.

      Unfortunately, this is not the way the bookmaker market works. The overround is the bookies’ margin to guarantee a long term profit. For the gambler, if you accidental keep choosing the bets whose odds have been artificially reduced by the bookmakers to reduce their risk, your long-term losses would be much higher than the overround of 5% only.

      Unfortunately, I cannot reply to your question in any greater length, but I will try to come up with an article which looks a little bit deeper into this issue.

      Thanks for your question and interest in Soccerwidow.

  2. panos
    7 January 2014 at 10:18 am #

    Hi , i’ve a question , people who have profit on betting like you , can you tell me what kind of mathematics and software use you? is enoug with excel or need i be an big expert in mathematics and software programming?

    So , i need to learn this: http://en.wikipedia.org/wiki/Probability_theory and http://en.wikipedia.org/wiki/Statistical_association_football_predictions to earn money in betting??

    its very difficult , it will take 10 years to learn it for me . maybe is better paying a software or follow some betting forums with some profitable strategy , (the main problem is the tipser dissapear many times in some months, usually when the strategy is very good).

  3. Soccerwidow
    7 January 2014 at 10:39 am #

    Dear Panos,

    You do not have to be a maths genius, but it is important to get the mathematical advantage onto your side (a casino does this by having a green zero on its roulette wheel, for example). Unfortunately, ensuring this mathematical edge is the only way to make money from betting, there is no other option other than being very, very lucky all of the time!

    Successful strategies involve fairly large portfolios of bets which means spreading risks between at least 50 to 100 games per round, and sticking to a disciplined staking plan. To publish this amount of tips perhaps 2 or 3 times per week is unfortunately too time consuming and obviously creates work in addition to all the necessary mathematical calculations behind identifying the picks. I need to remain sane and keep some time for other things! Placing this number of bets with the betting exchanges and bookmakers can also sometimes take a couple of hours.

    So, no, you do not need a degree in maths but Excel competence and understanding of odds calculation is essential. However, if there is a need for betting seminars and courses I am available for booking – just drop me an email.

  4. Andy
    7 January 2014 at 8:10 pm #

    Hi, this is a great article but I’m a bit confused over the probability calculations. In the first graphic showing Morecambe vs Macclesfield how did you get a probability of 61.1% from lay odds of 2.22?

    Your site is superb!


    • Soccerwidow
      7 January 2014 at 8:23 pm #

      Hi Andy, the shown probabilities are own computations. They do not necessarily correspond with Betfair odds. This is where ‘value’ comes in, if you achieve to get a mathematical advantage over the market prices.

  5. Andy
    8 January 2014 at 7:34 am #

    Oh that makes sense then. I was struggling with how you had converted from the Betfair.odds. I have been studying an Open University statistics course and the idea of binomial probability distributions and combinatorics are of great interest to me. The theory you have outlined is excellent for a newbie like me and I will be paper testing some of these ideas over the next EPL season.


    PS Thanks for your swift reply!

  6. Tsip
    8 January 2014 at 6:23 pm #

    Great work Soccerwidow, thank you for sharing all this work with us. I have a question though. If you want to play these six matches in doubles, triples and quadriples wouldnt the system be more profitable, if u do the math? Like asking for all triples and quadriples out of the six.

    • Soccerwidow
      8 January 2014 at 7:02 pm #

      Just calculate your theory through and then write an article summarising your results. This would be really great!!

      Although, because of bookmakers’ overrounds I wouldn’t think that any doubles, triples and quadriples make any system be more profitable. A system has to be working in itself, meaning with singles only.

  7. Tsip
    8 January 2014 at 7:19 pm #

    Lets say u have a system with 70% probability and every single matches odd is 3. Then the expectancy is 2.1. If u play 10 matches every weekend and lest say the probability of winning each match is also 70%, although the overrounds are big, maybe it is more profitable not to play them single, but in combinations and try to find the best combination which gives the best outcome to the system. This is what i am trying to do, as everybody says play singles, but i havent seen anywhere why, apart from the overrounds, but i think if the odds are big like what i have described above, i think that a system betting on triples or quadriples or so, may be more profitable. I am searching myself for the right math to evaluate this, but as i see, u didnt do any research yourself on this subject, did u?

    • Soccerwidow
      8 January 2014 at 7:23 pm #

      Just calculate it through and do a simulation. You will see by yourself that singles are the way to go.

  8. Johny
    8 January 2014 at 7:24 pm #


    I too noticed rather strange probability/odds ratio in your example, especially #3 odd of 4.1 with your calculated winnig probability of 77%.
    Could you elaborate this a bit further?

    • Soccerwidow
      8 January 2014 at 7:34 pm #

      The last column in the table contains the (own) calculated probabilities to win the lay bet, not the converted Betfair odds into probabilities.

  9. Johny
    9 January 2014 at 12:07 am #

    Sorry for coming back again 🙂 but after more carefully reading the article I realised that you’re using value bets which naturally skew the probabilities.
    If the odds in your example were real values the success rate would be 56.83% and the distribution would also be affected, producing (very probably) even game in the long run.

    Basically it doesn’t matter if one makes such a portfolio of several bets or make individual bets, except for diversifying, where a portfolio helps against long negative streaks.

    Also if using a portfolio/set of bets, isn’t it a better idea to use “dutching” instead of the same stake/liability for every bet?
    In that way one is not concerned about different winning/losing combinations, but only with number of winning/losing bets, (where each bet produces exactly the same outcome).

    In short it is not surprising that the value bets produce positive outcome, one can use them in any way he wants.

    • Soccerwidow
      9 January 2014 at 6:29 am #

      To dutch the bets within the portfolio is an interesting idea. I haven’t thought about this yet.

      However, I would think that this would require a portfolio which contains same probability bets only, and the same number of bets each round. Otherwise there would be a lot of confusion and stakes would be unequal. This would increase the risk of the bank being hit by a losing run. But this is an educated guess. I don’t know for sure.

      Otherwise, you are of course correct. Having value on your side, it really doesn’t matter how you use the selections and mix them – They will always produce a positive outcome on the long run.

  10. John
    9 January 2014 at 7:05 pm #

    Hey soccerwidow.I really like this post but I have a lot of questions for you.First I want to ask you about the action you choosed.You picked LAY HOME at Morecambe vs Macclesfied but at combined bets you can’t choose lay only fixed odds.Next you staked 8.33 euro for every team but there are a lot of combinations and the amount of 50 euros is overpassed.Another question is that all the tables give a proffit but if you play combined not every combination gives you a proffit so the tables give you wrong informations about the winnings.I would really appreciate if you can answer my questions!Thanks!

    • Soccerwidow
      9 January 2014 at 8:44 pm #

      Hi John,

      this article is intended purely as an example to make a point.

      You can chose fixed odds for laying using betting exchanges or finding a combination of back bets with traditional bookmakers. For example: When to Back Instead of Lay Betting: Asian Handicap; Double Chance; Dutching…

      • John
        10 January 2014 at 9:44 am #

        Ok.I got it.But how about the stake cuz for example if you win a 4/6 combination you don’t loose 8.33+8.33 like in the example…

        • Soccerwidow
          10 January 2014 at 11:00 am #

          Hi John,
          it’s about the probabililities to win the lay bets. The market odds may be totally different, and you are looking on long term profits.

          You are right, in the example if you win a 4/6 combination you don’t loose 8.33+8.33, but this topic goes far beyond this article.

  11. Johny
    9 January 2014 at 9:39 pm #

    OK, my bad. I missed the “Action” column.
    Lay 4.1 is indeed equivalent to 1.32 back, very close to your probabilities.
    Sorry for the confusion and thanks for your time.

  12. Kendall
    11 January 2014 at 7:19 pm #

    Great post. I used to be checking continuously this blog and I’m impressed! Very helpful information specifically the closing phase 🙂 I take care of such info a lot. I was looking for this certain information for a long time. Thanks and best of luck.

  13. Scott
    17 January 2014 at 7:14 am #

    Hi great post 🙂
    A quick Q

    If you had a program that assigns a (+-) goal advantage to the home team how would you get fair odds from this info.?

    TEAM A should beat TEAM B by 0.5 goals, I can not think of a fair way to price up with this known info. I tried to work backwards from bookmakers handicap odds but i cant work it out or even get close. Im sure there is a basic formula that would give a rough estimate. STUCK PLEASE HELP…

    • Soccerwidow
      17 January 2014 at 4:06 pm #

      Hi Scott,

      I have developed a True Odds & Value Detector to calculate probabilities and therefore price true odds for League Games with H2H History. The calculations return probability projections within a variance of only 2-3% which, I think you would agree is accurate enough.

      Mathematically speaking, neither ‘goal advantage’ nor ‘home advantage’ are arithmetical terms with meaningful quantitative data which can be analysed and used for calculations. There is a tutorial addressing this issue: Correct Assignment of Football Data to Levels of Measurement.

      I hope this helps.
      Best regards, Soccerwidow

  14. Mark
    3 March 2014 at 7:06 pm #

    This article is nonsense. Betfair prices are notoriously efficient so if the BF price is 2 then the probability is 50% not some exaggerated probability that you have invented to try and prove that your system works.

    If you can show me a way of guaranteeing a 55% probability on a price of 2.0 then I would be more than interested.

    • Soccerwidow
      4 March 2014 at 5:57 am #

      Hi Marc, I’m not ‘inventing’ anything. I’m just explaining maths and statistics and their application to betting.

      Until October 2012 I was a regular author for the Betfair blog in Germany (until Betfair moved away from Germany due to change of gambling law). Further, I was regularly publishing overviews, analysis and statistical explanations for my published picks for Betfair: Soccerwidow’s Value Betting Results: 274 Bets, from 07/12/2011 to 30/06/2012

      Betting is not easy, and there is (and never will be) a ‘guaranteed’ strategy. Without proper understanding of odds calculation and statistics the bettor has no chance.

      There is a reason why bookmakers employ odds compilers and statisticians, and pay them high wages. Bookies would certainly save themselves these expenses if there would be any other way to come up with betting odds and make a profit.

  15. Paul
    8 August 2014 at 11:20 am #

    congratulations for the post, I know if it is possible how do you calculate to get a 61.1% chance to win the bet?
    I can not understand how to calculate these values.
    Thank you

    • Soccerwidow
      8 August 2014 at 12:12 pm #

      Hi Paul, spend some time reading the website.

      There are many articles which address probability calculation. Also use the the search box (top right). Then you will find lots of related articles to your search.

      I did one for you. Check it out here: calculate winning probability

  16. Adam
    20 August 2014 at 10:56 pm #

    Hello. I’m trying to find the probabilities of how many of 5 soccer matches will end in a draw. The possible outcomes are: 0 draws, 1 draw, 2 draws, 3 draws, 4 draws, 5 draws

    Game 1 (based on draw odds): 29% probability of a draw; Game 2: 31% probability of a draw; Game 3: 31% probability of a draw; Game 4: 29% probability of a draw; Game 5: 31% probability of a draw.

    I understand that multiplying all those percentages together gives me the probability that all 5 will draw, but I’m not sure how to calculate the probability for “0, 1, 2, 3, and 4” games that may end up in a draw.

  17. Soccerwidow's Bloke
    20 August 2014 at 11:45 pm #


    0 Draws = multiply the chances that each game will not be a draw. In other words, if Game 1 has 29% chance of a draw, then it has 71% of not being a draw. Just multiply all these latter percentages together.

    For one draw where Game 1 is drawn, multiply 29% by the remaining percentages of games not to draw, and so on.

    Page 4 of this article shows how to construct a table using 4 from 6 as the example. Just follow the same structure and scale it down to your needs.

    All the best.

  18. Mohamed
    15 October 2014 at 8:15 am #

    Hello Guys i have been betting for the last 6yrs and i came up with an idea. In soccer, when you are betting 1 match the outcomes are 3(Home/Draw/Away) so when you decide to choose an option (Home win) chances of you winning is 33% and the house is 67% irrespective of the odd.
    And when you betting 2 matches in a combination bet there are 9 outcomes(Home/Home , Home/Draw, Home/Away ,,Draw/Home, Draw/Draw, Draw/Away ,, Away/Home , Away/Draw . Away/Away)
    If you choose 1 option that is Home/Home chances of you winning is 1/9*100%(11%) and the house is 89% hence the reason for us loosing.But if you play 5 options out of 9 outcomes then you have a chance of winning 55% thats better than 11% .

    • Soccerwidow
      16 October 2014 at 6:20 pm #

      Hi Mohamed, betting would be soooooooo easy if the probabilities for each outcome (home/draw/away) would be always 33% each. Unfortunately this is not the case.

      Here is some reading on Probabilities, Expectations & Hit Rates

      Sorry to disappoint. 😉

  19. Mohamed
    23 October 2014 at 12:59 pm #

    Dont consider the odds because odds are there to confuse us more.
    On a personal opinion (Home/Draw/Away) have equal chances i.e 33% simply because the game has not been played yet. There is no way a team can have a higher probabality than another.

  20. Luis
    21 July 2015 at 8:23 pm #

    Hello SoccerWidow, I love Excel and I like to read you site. I would like you to help me in a formula. We have 1-x-2, when we pick the dutch 1x , for example, that is a combination of the 1 and X odds. What is that formula so I can put in my excel?
    Best regards

  21. kingsley
    2 November 2015 at 2:00 pm #

    Hi, as confusing as my qstion may be I ll try my best to make it clear..i ve been looking for a way to play a risk free bet..a way I can play all the possible occurence in a bet and one outcome will win…I decided to go with the goal goal and no goal goal option in football betting..i also decided to go with10 accumulated bets in each ticket,i ll play as many ticket as possible with different occurences..plz I ll like to knw hw many tickets I m supposed to play in a 10 match accumulator to ensure that one of the tickets wins

    • Soccerwidow
      4 November 2015 at 4:47 pm #

      Hi kingsley,

      what you are talking about is called “permutations” – the act of arranging all the members of a set into some sequence or order.

      The good news is: it can be calculated. Unfortunately, the bad news is: the topic and formulas cannot be explained in a short reply.

      For a start, check Wikipedia, or simply google “permutations”.

  22. vincent
    14 January 2016 at 12:56 pm #

    Hi Soccerwidow,
    Not sure if this blog is stil active or anyone following this.
    I would like to liaise with Mohamed on his strategy. My email adres is vincentrichter[at]yahoo[dot]com
    In a nutshell I have been playing and building on a system in the idea that Mohamed is thinking. Can you please put me in touch with him?
    If there’s anyone thinking in this same line, drop me a mail!!

    Thank you!

  23. Xy
    17 April 2016 at 10:06 pm #

    Nonsense indeed.
    What about the probability that they tie in which case you still lose your bet?

  24. Maxwell Chikara
    20 May 2016 at 9:15 am #

    Thanks for this great article, I haven’t finished reading it but I think it’s great. I always win by simply researching deep on a team and also using my instincts. Just two days ago I predicted 14 results (accumulators) which included Matchbets, that was awesome e.g. the Europa final, I just entered BTTS+2.5o. Then on online betting just placed a bet when Liverpool were leading at half time for a Sevilla win, the odds were crazy and tempting. I smashed the jackpot …. my best night so far. Research and Instincts.

  25. Fansville
    10 June 2016 at 4:35 am #

    Please help me clarify this.
    If i theoretically and continuously bet at the odd of 1.9 on every game with a 10% over-round; and i win usually between 54% to 57% of my bet on the long term (above 1000 bets – that i consider long enough, statistically speaking). Using a sensible betting bankroll and stake that can withstand highest losings sequence.
    NOTE: i do not consider calculating odds to check for value.
    Do you consider me betting on Value? If yes, can we have another explanation of value betting depending on performance of the bettor or system if successful in the long term. Am not so sure if my question will hit the nail where i want it but if am successful in the long run is it because am betting on value (even though i unconsciously don’t look for it) or my accuracy rate gives me enough winning percentages to be profitable in the long run?

    Thanks for your articles – so much value in a single place. Well done

    • Soccerwidow
      10 June 2016 at 9:07 am #

      Yes, if you have found an edge (mathematical advantage), then your are betting on “value”. It doesn’t matter how you found the edge.

      Odds calculation helps to understand what is going on, and find the edge, but there are certainly people around who can do it without knowing anything about odds calculation. Some people are born with a great sense of probabilities, but they are rare.

      Therefore if your accuracy rate gives you enough winning percentages, then congratulations!

  26. Aj
    21 June 2016 at 10:31 pm #

    Hi, a little investment of your time in understanding Kelly Criterion will give you the background to optimizing your bankroll what ever it’s size by giving you the optimal betting size based on your edge. Good luck

  27. Jaka
    14 September 2016 at 6:54 am #

    I would just like ask about Probability of Winning a bet. I can see there 1.58,1.93, 2.12,….
    You write like this:
    1.58 – 71%
    1.93 – 56.4%
    2.12 – 52.6%

    Mine calculation

    1/odd X 100 is %

    1.58 – 63.3%
    1.93 – 51.8%
    2.12 – 47.1%

    Did i calculate wrong or you write wrong?

    • Soccerwidow
      14 September 2016 at 7:39 am #

      The probabilities provided in the screenshot are not the “implied probabilities” (converted bookmaker odds). The shown probabilities are the “true” probabilities. Sorry, I didn’t explain it clear enough in the article.

      You are correct, if you convert odds, then odds of 1.58 convert into an “implied probability” of 63.3%, and so on…

      However, the prices (odds) which bookmakers publish are rarely the true probabilities (otherwise these guys wouldn’t make money, would they?). You have to calculate your own probabilities in order to recognise the bets which are worthwhile to bet on. I explain this in great detail in my course: Fundamentals of Sports Betting

  28. falconer
    13 January 2017 at 4:51 pm #


    If we do not bet these events as an each single event (like in the example) but for example a 6/4 system bet ( which contain a 15 4 fold accumulators) is the (event happennig hit rate) probability calculation the same?
    But of course the profit/loss scale doesn’t the same at all, right?


    • Soccerwidow
      13 January 2017 at 7:36 pm #

      The probability calculations are always the same, but you must not forget that the bookmakers have usually the mathematical advantage on their site. If you are playing accumulators you are not reducing their advantage.

      For example… 3 bets with a ‘true’probability of 50%. The fair odds would be 2.0. However the market offers these three bets at odds of 1.9 (implicated probabilities 52.6%).

      Your chances to win this accumulator are 50% x 50% x 50% = 12.5% (converted in odds: 8.0)

      The bookmakers are laying this bet at: 52.6% x 52.6% x 52.6% = 14.6% (converted in odds: 6.85)

      Can you see that you are buying this accumulator bet to a much higher price than the bookmakers have to pay out should you win?

      It’s a numbers game for the bookmakers. Of course, you won’t be the only one who plays accumulators. Of course, there are occasionally people who win an accumulator bet, but more often they don’t. It’s all about the mathematical advantage! Otherwise bookmakers wouldn’t stay in business!

  29. falconer
    16 January 2017 at 7:50 pm #

    Of course, I see.
    But in this example you wrote, you showed a non “value” bets example (50%-1.90), and of course , in this case it’s nevermind you bet single or accumulator cause you had not the advantage!
    But in the article you use 6 value bets. So simple bet the same 6 value bets as an 6/4 system bet not as 6/1. Of course you loose every time when you have 3 or less hit, but when you have 4 or more hit, the profit much higher. So the question: Is it much profitable to create system bets or accumulators with value bets (and only value bets) than bet these value bets as single bets in the long run?

    And another theoretical question: You use a value bet calculator to find value bets, I use another method, another person use another method, etc. There are several ways to find a value bet. But who decide which method is right? Is there a law (within probability or statistic) or something which differs the methods or show the right way? Or in this random process (betting prognosis) there are no such laws or methods which are right 100%, and only the results (hit rate or yield rate) justifies the methods?

    • Soccerwidow
      19 January 2017 at 9:07 am #

      Hi falconer, many roads lead to Rome. 🙂

      There isn’t anything in life which has a 100% certainty. You can come close but never to 100%!

      Therefore, whatever method of statistical prediction you use, only the results (hit rate, or yield rate, or comfort zone or, or, …) justifies the method.

      Regarding accumulators, you only decrease your probability to win. If only one leg goes wrong you also lose the winnings for the bets you actually got right. If you want to play accumulators then play them as individual bets. This is how it works: Place the first bet… if it wins then use the winnings to place the second… and so on. Keep some of the winnings to yourself, and if at some stage one leg goes wrong you still have something left.

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