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title, source, author, published, created, description, tags
| title | source | author | published | created | description | tags | ||
|---|---|---|---|---|---|---|---|---|
| Math Over Gambling: How Quants Make Millions on Sports Betting | https://x.com/goatyishere/status/2044003377474867481 |
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2026-04-14 | 2026-04-26 | 90% of people bet on sports like it’s a casino, and they loseThe other 10% are playing a completely different game.They don’t guess, they ca... |
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90% of people bet on sports like it’s a casino, and they lose
The other 10% are playing a completely different game.They don’t guess, they calculate
Probability. Edge. Expected Value
That’s how millions are made
One of the people breaking this down is Alex Monahan (Stanford, ex-trader at Susquehanna International Group, founder of OddsJam, sold for $160M)
His lecture isn’t about sports. It’s about decision-making through math
The Core Idea
Sports betting = true probability vs implied probability
If you don’t understand the difference, you’re paying the market
1/ The Book Always Wins
Odds are never “fair”.
Sportsbooks bake in vig (their edge)
Example: 50/50 event → -110 / -110
That means:
- each side ≈ 52.4%
- total >100% → the difference = bookmaker profit
You’re playing against a system that’s already winning
2/ Where the Money Is
Your job is to remove the vig (de-vig) and compare:
- if your probability > implied → +EV bet
- if not → skip
Example: -150 = ~60% implied if your model says 64% → that’s edge
Every bet = a small mathematical advantage
3/ Arbitrage = Risk-Free Profit
Different books = different prices
You bet all outcomes → lock in profit
Typical ROI: 5-10% in minutes
But:
- opportunities are rare
- they disappear fast
- books limit winners
This is trading, not gambling
4/ How the Market Actually Works
Sportsbooks = market makers
- balance money on both sides
- move lines when there’s pressure
- react to sharp bettors
Sharps move the market Public pays for emotions
This behaves exactly like financial markets
5/ +EV Is Everything
You don’t need to know sports better than everyone
You need to:
- find mispriced odds
- compare across books
- bet only when EV is positive
Strategies:
- Middles (win both sides in certain outcomes)
- slow-moving lines
- cross-book discrepancies
6/ Why Most People Lose
- vig eats your bankroll
- parlays amplify losses
- prop bets often have 20%+ house edge
You can be right often and still lose money
7/ The Real Skill
Decision-making under uncertainty
You never know the outcome But you can make +EV decisions
This applies everywhere:
- trading
- business
- life
8/ Final Take
- 95% of bettors lose
- not because of luck, because of no edge
- pros play probability, not sports
Betting stops being gambling once you understand the math
Full Lecture (Highly Recommended)
Massachusetts Institute of Technology lecture by Alex Monahan
🎓 https://www.youtube.com/watch?v=6mTvAjmF2-A
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In the long run, the winner isn’t the one who guesses right, it’s the one who has edge