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Take it or leave it

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Summary

Analysis Of The Results Obtained

On September 1st, WinnerOdds published again Minimum Profitable Odds. After analyzing the August results, everything was ready and we were ready to resume betting.

The results after 15 days (analysis made at 20:00 on September 15) of all WinnerOdds users is -71,000 euros, far from what we would like.

Is it variance? Has the COVID breakdown affected the method? As I commented in the Telegram groups, in the long term (years) the method works. It is backed by the results of more than 4 years (even though past performance do not guarantee 100% future performance). But after more than 33,000 picks, the probability of having won by luck is negligible.

Assuming that the long term method does indeed work, is it possible to obtain these poor results in this short term?

Expected Value

As you know, we place bets with positive expected value, which can be calculated as:

EV = Bet size * (Bet size * Probability – 1)

Since the results have been bad, if an assumption is made that the probabilities used to calculate the minimum odds are not sufficiently accurate, then we need another way to estimate the actual probability. Commonly, according to CLV (Closing Line Value) theory, a good estimate of the actual probability is considered to be that calculated from the final odds. To this end, I have used the final odds of the following bookmakers, if they exist, in this order: Pinnacle, Marathon bet, Bet365, or any other bookmaker where a first bet is placed by a WinnerOdds user.

Once the final odds have been chosen, the real final odds with no margin are calculated from the formulas:

Margin = (1 / Final odds player 1) + (1 / Final odds player 2) – 1

1Real final odds = 2 * Final odds / (2 – Margin * Final odds)

“Real” probability = 1 / Real final odds

1As explained by @12xpert in his excellent article:

https://www.football-data.co.uk/The_Wisdom_of_the_Crowd_updated.pdf

As average betting odds, I have taken the liberty of dividing the potential profit of the bets registered by all users if successful, by the total bets of the users, plus 1:

Average stake = (Potential profit / Total stake) + 1

That is, we take into account the different odds bet from the initial odds until the odds cross the minimum profitable odds and we stop betting (if odds are decreasing and cross it), or until the real final odds if they are increasing.

Finally, the expected value of each bet can be calculated as:

EV = Total amount bet * (Average bet quota / Real final odds – 1)

To give some examples:

Tournament ITF-W Varna ATP Kitzbuhel ATP Rome
Match date 10/09/2020 07/09/2020 14/09/2020
Player 1 Chantal Sauvant Egor Gerasimov Tennys Sandgren
Player 2 Andreea Amalia Roșca Alexander Erler João Sousa
Minimum Profitable Odds 1.097 1.08 1.782
First bet odds 1.222 1.29 2.55
First bet bookmaker Bet365 Retabet Codere
Total amount bet                   20,774.10 €                   21,613.40 €                       1,182.90 €
Potential profit                     3,330.70 €                       4,713.30 €                       1,251.10 €
Result 6:2 4:6 7:6 7:6 6:3 6:3 6:0
Profit -20,774.1€ 4,713.3€ 1,251.1€
Average betting odds 1.160 1.218 2.058
Real final odds bookmaker pinn pinn pinn
Player bet 2 1 1
Bet final odds 1.085 1.302 1.571
Rival final odds 6.73 3.58 2.43
Margin 7.02% 4.74% 4.81%
Real final odds 1.128 1.343 1.633
Expected value 595.66 € -2,016.86 € 307.94 €

If we add up the expected values of all the bets, the average result we should have obtained is +22,871.12€.

Variable Real result Expected Value
Number of bets 437 437
Total amount bet 1,128,877.80€ 1,128,877.80€
Profit -71,690.10€ 22,871.12€
Yield -6.35% 2.02%
Average odds 1.516 1.516
Profit per bet -164.05€ 52.33€

To make this calculation, of the 437 bets, 383 final odds are from Pinnacle, 32 final odds are from Marathon bet and 22 from the first bookmaker bet by a user.

To sum up, with respect to the “expected” calculated with this procedure, we are about 93,000 euros below after 437 bets.

Take it or leave it

* In the graph you can see more bets, but they are those in which the amount bet was 0, that means 0 EV and 0 profit.

How rare is this result?

As we have an estimate of the real probabilities of the result of each match, considering that the bets are independent, we can make simulations with the Monte Carlo method and add up how much we would have won or lost after repeating all the matches, for example 10,000 times.

If we represent the result of the simulations in a histogram, the following distribution is obtained:

Take it or leave it

According to this distribution, the probability of obtaining a result of -60,000 or worse is 9.5%. The probability of finding a positive result is 63.3%. The probability of having earned more than 100,000 euros is 8.8%.

In other words, we had about the same chance of losing more than 60,000€ as we did of gaining more than 100,000€. 437 is a tiny sample size, or we have to assume that the CLV theory is totally wrong (the real odds should be very different, always, from the inverse of the real final odds without margin).

How have the odds shifted?

It is interesting to know whether our minimum odds estimates are in line with the “market” or not. Well, of these 437 bets, let’s count:

  • how many times the actual final odds are lower than the average bet, but higher than the minimum profitable odds
  • how many times the real final odds end up below the minimum profitable odds
  • and how many times the real final odds are higher than the average bet
Odds change N %
Average Odds > Real final odds >= Min Odds 65 14.9%
Average odds >= Min odds > Real final odds 276 63.2%
Average Odds <= Real Final Odds 96 22.0%
Total 437 100.0%

It can be observed that most of the time (78.1%), the real final odds without margin are lower than the average odds bet by WinnerOdds users, that is, we are managing to bet with a positive expected value. In the case “Average Odds > Real final odds >= Min Odds” (14.9%), the faster ones get the higher odds, and the slower ones may be betting a little bit below the real odds. However, in the most frequent case (63.2%), “Average odds >= Min odds > Real final odds”, everyone is betting with EV+ (as long as they bet above the minimum profitable quota).

Finally, we see that in 22.0% of the bets, “Average Odds <= Real Final Odds”, that is, the market does not move or finally evolves in the opposite direction to that which marks the minimum profitable quota, but of course, we cannot know this in advance.

Self-fulfilling prophecy?

WinnerOdds users’ bets also “push” the final odds down, so we could be making the mistake of giving a prediction (the odds are profitable and the real final odds should go down), and causing precisely that prediction to come true, which is called a “self-fulfilling prophecy“.

It is impossible to know where the real final odds would have ended if we had not bet, but we do know that odds do not always move in the direction predicted by WinnerOdds, and therefore we know that there are many more people betting, especially at Pinnacle where the liquidity is more important and the bets of WinnerOdds users are diluted in the sea of gamblers.

On the other hand, most of the bets made by WinnerOdds users are not at Pinnacle, which is the bookmaker that can best represent the market, since they do not limit and allow a bigger final liquidity.

Finally, our algorithms are “trained” against the initial odds of the bookmakers, so in the long term, although we affect the final odds, we are “fighting” to be better than the bookmakers in the initial odds, and then the market moves in one direction or another, after we have already bet.

Furthermore, we can compare with the same analysis made, for example, the month before the stop due to the COVID.

Pre-COVID” analysis

The pre-COVID analysis, between 14 February and 14 March 2020, leads to the following results:

Variable Real result Expected Value
Number of bets 636 636
Total amount bet 1,422,534.7 1,422,534.7
Profit 185,642.60€ 67,598.20€
Yield 13.05% 4.75%
Average odds 1.566 1.566
Profit per bet 291.89€ 106.28€

In other words, on this occasion, more was gained than expected taking into account the real final odds as a reference for calculating the real probability. The yield on 636 bets should have been 4.75%, a value very similar to the long term yield obtained by WinnerOdds users, but nevertheless 13.05% was obtained.

Take it or leave it

* In the graph you can see more bets, but they are those in which the amount bet was 0, that means 0 EV and 0 profit.

The odds movements are very similar, with percentages of each type of movement very similar to those of the last 15 days:

Odds change N %
Average Odds > Real final odds >= Min Odds 109 17.1%
Average odds >= Min odds > Real final odds 457 71.9%
Average Odds <= Real Final Odds 70 11.0%
Total 636 100.0%

And finally, what was the probability of winning more than 180,000 euros, and of ending up losing? We see it in the histogram after making 10,000 simulations with random match results according to the probability implied in the real final odds:

Take it or leave it

The probability of winning 180,000 euros or more was 4.3%, while the probability of ending up in a loss was… still 19.2%!

Winning at 13% average yield of all users after 636 bets is a lot of luck, when in the long run the average is about 5%.

Conclusions

If the CLV (Closing Line Value) theory were true, we would have suffered “negative” variance, and regression toward the mean if we consider the February and March results.. As we know, for average odds around 1.6, less than 1000 picks will be very affected by the variance.

I am not in favour of accepting this CLV theory 100%, since, although it is true on average, we do not bet on all matches, but on a selection of them. However, in the short term, it is a good estimate that we have of the real probability of each match, so at least theoretically “we are beating the market”.

I hope that the results will improve. Anyway, we shall see what happens when we repeat this analysis later.

We may or may not like it, but gambling is like it is. Take it or leave it.

Update 12/02/21

We have published almost 2000 picks since we returned to action, after the hiatus due to Covid-19. Variance has once again taught us that betting is a long term proposition and that we should avoid riding the short term highs and lows of the daily grind.

Many users left, it’s normal. However, many others trusted our system and long term results. What we could see was:

  1. We were betting EV+, according to the probabilities implicit in the closing odds.
  2. If we had been able to totalize all the bets, we would have obtained positive results.

We checked the system as usual to verify that everything was correct and we were betting EV+ (1), and we also decided to delay our publishing of the Minimum Profitable Odds (2), allowing us to totalize more bets.

Sometimes this strategy may cause us to miss betting opportunities, however, those are opportunities that would only allow us to bet at low volume. But by waiting before publishing the MPO, we can place higher volume on every bet.

After almost 2000 bets, these are the EV+ and real results:

Take it or leave it

We are still below the EV, but we have already recovered the drawdown losses. Are we better now than we were before? If we accept that the closing odds represent the real probabilities, the EV line shows we should be winning more or less at the same rate per bet than during the drawdown.

We knew that we were affected by variance. How important is that variance? If we simulate the results of all our bets 10,000 times, the distribution of profit would be around an average profit of 50,000, that is the Expected Value, but the real results are that 2000 bets are still influenced by luck. We are now closer to the average and going up, but that doesn’t mean that we cannot have another bad streak, sooner or later we will suffer it again. Take it or leave it.

Take it or leave it

The probability of having had losses is around 25%, approximately the same probability of a profit higher than 120,000€.

Like Nadal when he won a set after losing with a score 5-1 40-0 against Andujar in RG2011, he probably knew that he was doing well. He knew that sometimes the ball bounces outside the line. But that is what happens when you try to win and you have to risk. No free lunches.

https://youtu.be/l7MwSfn75Yk

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Autor
Miguel Figueres
Miguel Figueres
BTC/ETH FTW Civil Engineer. Associate Professor at UPV. Specialized in Artificial Intelligence. CEO and creator of @WinnerOdds

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Comentarios
  1. Hola Miguel, tengo algunas dudas acerca de gestión de banca y también sobre uso de mercados en tenis. La consulta puede ser algo extensa, porque hay varios puntos que me gustaría tratar. Si tienes algún mail donde trasladarte dicha consulta y por supuesto si tienes a bien el aceptarla por favor déjamelo por aquí y te la trasladaré a no mucho tardar.

    Un saludo

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