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Could survivor bias be a more likely explanation than a good system? I mean among a large pool of people systematically betting on horse racing, a few are likel
by brudgers 2y ago
Could survivor bias be a more likely explanation than a good system? I mean among a large pool of people systematically betting on horse racing, a few are likely to have winning outcomes.
- Allybag 2y agoI am a professional automated sports gambler, and I win basically every day, and the handful of losing days I have per quarter are significantly smaller than the average daily win. If you place enough bets (I make about 15k bets each day that are matched) that have a positive expected value your chances of a losing day become pretty low. For example, I had a losing day on Christmas Day, but was only able to place about 500 bets as it was such a big holiday that there were almost no events.
- anoncow 2y agoTeach me your ways.
- MaxikCZ 2y agoAnd me please, ill give you some portion of my profits :P
- Someone 2y agoI don’t know their ways, but I expect there’s a lot of emotion in sports betting that can be exploited (bookmakers will not purely optimize for expected profit, but also want lower variance in their profits). If so, betting against clubs in rich countries where betting is popular is the better option. Whether it beats the bookmaker’s margin I wouldn’t know.
- le-mark 2y agoThese guys never talk about the details. Either they’re LARPing or there’s something to it. “Betting exchange” is your clue. I’ve followed this thread before. Apparently the exchanges are mostly in Asia and allow people to buy and sell bets. So presumably this person is placing bets well before the date the event occurs and using them to arbitrage the result as the event nears. This is due to line movement up to the event. To participate in this you have to use btc/crypto and risk being ripped off with no legal recourse. Also presumably there’s a system around what bet to place when. They never talk about that.
- refulgentis 2y agoNot even wrong, in the Pauli sense. > allow people to buy and sell bets. Can't sell - you can buy, or find a counterparty. The exchange part is finding a counterparty. > placing bets well before the date the event occurs and using them to arbitrage the result as the event nears. Narrowly correct -- we could, of course, offset our X wins bet at $100 with a Y wins bet for $20. The implication is this is done by selling bets, which as mentioned above, isn't a thing in this world. Are there some websites where this can be done? yes. Is it widespread? No. Is it implied by the phrase betting exchange? No. The implication with betting exchange is "you're not betting against us, we're not making lines, we're just matching you up with a counterparty, so our incentive structure is aligned with you, we'll build an API even. also fees are much lower, its a pure rake" > you have to use btc/crypto and risk being ripped off with no legal recourse Sites that only take crypto do exist, but its certainly not a given or predominant. > Also presumably there’s a system around what bet to place when. They never talk about that. This is confusing because: - you spelled out a system, intuitively, that most people would grok instantly (arbitrage on the line) - "presumably" is doing 0 work, besides implying there's some hidden secret: any system involved in placing bets would have to provide information on what bet to place. :) Generally, I don't think it's anyones job to spell out how to pull off consistent net-positive money machine, and it's quite odd to not only want it, but expect it.
- le-mark 2y agoThanks for the corrections; more info to refine my understanding. In a way it seems you are the book maker and the “exchange” is the platform that lets you do it (matches bettors).
- Allybag 2y agoTo give some details, the main betting exchange I use is Betfair, a UK betting company part of the same group that own Fanduel, and I place bets for or against outcomes in the last half an hour before the start. For example, you can back a team to win meaning you make a certain amount if the team wins, but you can also lay a team, meaning that if that team doesn’t win (another team wins or it’s a draw) you win that bet, with a payout of inverse the odds. There is no crypto involved, just GBP, and Betfair is a multibillion dollar company paying taxes and subject to the law and the UK regulating bodies. I have a model to predict short term movement in the odds, which is not amazing but enough better than random that it can overcome the fees and spread between the back and lay odds and be profitable. Any further questions?
- FergusArgyll 2y agoAlways bet against the Jets You're welcome
- wodenokoto 2y agoHow do you place so many? When you read about small fish manually betting on sports sites they get kicked off when winning too much.
- Allybag 2y agoIt’s automated, I bet on a betting exchange which has an API, so the bets get placed without any input from me. As it’s a betting exchange they don’t care if you win or lose as you aren’t winning money from them, but they start to take steeper cuts of your profits if you’re a regular winner above some threshold that a random punter is very unlikely to hit.
- sourcepluck 2y agoBetfair, or somewhere else, if I may ask?
- Allybag 2y agoYep, atm exclusively on Betfair but trying to expand.
- sourcepluck 2y agoI've probably 10 more questions, but you've already shared generously in a couple of other comments. Thanks for that. I've bookmarked, and will investigate. Best of luck with it
- pakitan 2y agoYou can't become a billionaire by betting on hundreds of thousands of events via "survivorship bias". It's about as likely as getting 1000 monkeys typing on typewriters and producing Shakespeare's works in 10 years.
- brudgers 2y agoYou might win a billion USD in a single lottery draw. https://www.nytimes.com/article/lottery-jackpot-record-powerball-megamillions.html https://www.nytimes.com/article/lottery-jackpot-record-power...
- pakitan 2y agoYes, you can. Not sure how that's relevant to the discussion though.
- bryanrasmussen 2y agoit's a typical HN Gotcha of which I myself am often guilty, given hundreds of different chances, and one of those chances can make you a billionaire, then you can become a billionaire by betting on hundreds of different chances - but of course horse race gambling doesn't give you that billion in one shot chance. on edit - well I guess it technically does it give it, but at such a high rate of investment it isn't really that worthwhile either. The point about the lottery is that a single ticket which costs little can return a billion. A horse race that returned a billion probably needs at least a 100 million to be bet, which is probably not even possible.
- brudgers 2y agoDo you think the probability of a working system are lower than the probability of laundering money at the racetrack? If you start with two billion, it’s relatively easy to walk away from the track with one.
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- nycdatasci 2y agoDefinitely not luck. Bill runs with the same crowd that wrote the bible on advantage play (James Grosjean, etc). They are exceptionally talented.
- skippyboxedhero 2y agoBill originally worked with a team of people doing this in HK (that later broke up, some of the people involved were...characters). There was a whole group of people doing this in the 90s (some of these teams also did Japan). I believe he did stuff in casinos but parimutal obviously had a lot more scale.
- nycdatasci 2y agoExactly right. Impossible for individuals to operate at this scale. Bill led a large operation. Similarly, advantage play frequently requires teams to execute as you are often hoping to land a specific seat with a specific dealer.
- caminante 2y agoIt's closer to a hedge fund finding asymmetries (e.g., under/over valued odds by bookmakers, bulk buying strategies when phone buying is turned off, etc.) plus some structural benefits (e.g., HK was a gambler's dream. Winnings were exempt from taxation! And the "pit boss" for the horse-racing scene wasn't kicking them out.) These don't apply to all horse-racing scenes. These advantages emerge, but get competed away. Look at how the protagonists here were in black jack card counting teams. They do make money until they get blacklisted.
- sourcepluck 2y agoI only learned yesterday after reading this article that, apparently, a good many countries have no taxes on gambling wins. The reasoning is - again, from my quick bit of reading, if someone in the know wants to correct me please do - that most people lose, and the government doesn't want to be liable to help all the people who lose heavily. Which is great for the pros, I suppose. Here's a list of countries, which you'd have to check individually, after I searched "gambling tax free countries": Austria Australia Belgium Bulgaria Canada Czech Republic Denmark Finland Germany Hungary Italy Luxembourg Malta Romania Sweden United Kingdom
- sourcepluck 2y agoHmm, reading a bit more on the same article, i.e., this one here: https://www.vegasmaster.com/gambling-tax-free-countries/ https://www.vegasmaster.com/gambling-tax-free-countries/ I see these relevant lines: > The laws concerning gambling tax around the world aren’t all black and white. In most cases, there is a sort of gray area which states that you will be taxed on winnings if gambling is your profession or your main source of income. However, if you gamble and win but you have a bigger source of income and don’t rely on professional gambling to pay the bills, you won’t be taxed. In other countries, like Kenya and Ireland, players aren’t taxed on their winnings, but bookies must pay a certain percentage of taxes on the total bets or winnings they record. In Ireland bookies must pay 1% on all bets placed through them, while in Kenya bookies have to pay 7.5% tax on all winnings they record.
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- whimsicalism 2y agoyes survivorship bias almost certainly plays a little bit, but i also imagine that there is great arbitrage on int'l horse betting markets prior to like 2012
- ACow_Adonis 2y agoI'm a very cynical man who has also had the honour of working for the national statistics organisation, so take what i say with a grain of salt. While there are lots of "real and theoretical gains" to be made in gambling, a far more cynical take is that the "advanced analytics" is the frontbusiness for the real money being made by criminal enterprises, insider-trading, front-running, special access advantages, arbitrage, regulatory and competetive inefficiencies and insider-jobs. "No no, we're all really smart see, look at this math that you don't understand, that's how we make millions while being bankrolled by mysterious money and business partners from vegas, who also by definition can't understand the math and hence can't validate what we're doing but who are totally willing to just front us a bankroll :)" Its possible that there are certain gains left on the table, especially in old and early markets, but be wary of anyone being bankrolled by external forces and earning millions/billions and needing to explain that wealth with "smarts". Often i wonder whether these articles that appear aren't a form of marketing or reputation laundering, but i have absolute no proof and i'm not particularly interested in looking into it much further. So you know, i'm probably way off :)
- caminante 2y agoThe article is messy in that sense, but you already knew that was the reality. It's smart people that found a system they could exploit. In poker, the top cash players win by choosing who's (i.e., lesser players) in their games, not playing against other top players. People with math acumen are most likely to find some of these anomolies like the Stats PhD who kept winning scratch off lottos.[0] > Its possible that there are certain gains left on the table, especially in old and early markets, but be wary of anyone being bankrolled by external forces and earning millions/billions and needing to explain that wealth with "smarts". Do you have favorite examples in mind? [0] https://www.dailymail.co.uk/news/article-2023514/Joan-R-Ginther-won-lottery-4-times-Stanford-University-statistics-PhD.html https://www.dailymail.co.uk/news/article-2023514/Joan-R-Gint...
- ACow_Adonis 2y agoI don't have any immediately at hand, so whether you believe some random guy on the internet from here on out on is up to you. I actually did a little bit of private investigation myself into betting markets of a handful of sports a number of years ago out of both curiosity, and potentially profit. And I'm currently working on perceptions of skill and merit along various systems just for my own intellectual project. I find it interesting you've discovered the systematic bias strategy of choosing your opponents and events (these are done both consciously by players in various systems, but often formally and informally supported or enabled by various governing bodies and competitive structures). Aside from both the boredom (arbitraging and scraping stats can be meticulously dull especially in fields you have no interest in or if you lack a hustler or profit maximising mentality or significant bankroll), opportunity cost (how much you can earn in other markets with such skills given equal investment of time and safety), the moral question (you're taking money from other ignorant bettors and I personally consider a lot of gambling and exploitation of people's ignorance relatively immoral, the house/market maker in many contexts still profits just through sheer trading frequency or other profit making actions), these days you have many market makers targeting little sharps presumably because they want to keep their ignorant base happy and gambling and don't want the perception of playing agaist certain losses or against people capable of seeing through the systems to reveal internal operations. That's the only reason I can come up with for why they target and close accounts of profitable gamblers while they're still taking the house edge on every bet as profit. What I (of course) also informally discovered in some markets I looked into was evidence of various fixing activities and systemic biases. Now if you were going to do this for large scale profit, one of the things you are going to have to do is stop the illusion you're modelling skill and start modelling corruption. It's all well and good for these articles to come out and pretend skilled prediction will win you millions, but you can be the best statistician in the house and if you place bets in a game based on models of skill, but the game outcome is rigged, you can kiss goodbye to your bankroll. Criminals win because their outcomes aren't statistical or based on skill. And now you're suddenly in the business of modelling and fighting people who profit from rigging markets rather than morally neutral statistical models in games of skill. You can of course model such and go down that rabbit hole, but at some point you either buy into such a world and get involved (either by being hired by or interacting with criminal and questionable enterprise) or you are effectively trying to do statistical surveillance of criminal activities... Which will then show up in the statistical patterns of your own betting activities and potentially alert said enterprises to your existence. And that's about where I bowed out of my investigations and turned back to more theoretical work. That's not particularly a world I want to be involved in, but I am relatively confident popular sports and markets have illicit match fixing and other activities going on in them at significant levels, but I'm not interested in fighting with or building implicit knowledge bases of people who have million dollar anonymous backers from Vegas, billion dollar contracts, and whom die from accidental sleeping pill overdoses... If you know what I mean ...
- mkj 2y agoQuite possible. David Walsh (of Tasmania's MoMA) had a similar betting system to make his fortune. A story/warning he told to a hedge fund conference was that he _did_ think his system was infallible/bound to win, but revisiting the calculations later it turned out the expected value would be failure - he just happened to win at the right moments, initially. (Australian Financial Review article from a couple of years ago)
- RossBencina 2y ago*MoNA, Museum of Old and New Art
- mkj 2y agoUrgh yes. Thanks