What is a same game parlay and how does it work?
Written by Same game parlays are the most heavily pushed bet on every sportsbook app, and there's a reason for that. They're fun, they're easy to build, and they make the book more money than almost anything else on the screen.
The thing that makes them different from a normal parlay is one word, and once you understand it you'll see exactly why the payout never looks as big as you expected.
What a same game parlay actually is
A normal parlay pulls legs from different games. Lakers to win, Chiefs to cover, Yankees over 8.5. Three games, three bets, welded into one ticket.
A same game parlay pulls every leg from one game. Chiefs to win, Mahomes over 250 passing yards, Kelce to score a touchdown. One game, three bets, same ticket.
The word is correlation
Legs in the same game affect each other. If Mahomes throws for 350 yards, the Chiefs probably won, and Kelce probably caught a lot of it. Those three things want to happen together.
That sounds like good news for you. It kind of is. It also means the book can't price the ticket by multiplying, and neither can you.
Why same game parlay odds do not just multiply
Two coin flips in different rooms both landing heads is 25%. Half of a half. That's what multiplying means, and it works because the coins don't know about each other.
Now glue the coins together. Each one is still 50% on its own. But both landing heads is no longer 25%, because when one lands heads the other one does too.
The book runs a model that works out how linked your specific legs are, then prices the ticket off that. The more your legs help each other, the shorter your payout gets.
What that means for you
Three things worth knowing before you build one.
Are same game parlays worth it?
Here's my honest take. As a strategy for making money, no. You're paying a premium on every leg and then a second premium on the correlation model. That's a lot of house edge for one ticket.
As entertainment, they're great and I'm not going to pretend otherwise. One game, one screen, three things to care about for three hours. That's a good Sunday. Just size it like entertainment money and not like a plan.
The one spot where they get interesting is when a book's model undervalues how linked your legs really are. That happens, and it's what sharper bettors hunt for. It also takes a lot of work to find, and it is not what most people are doing when they tap four legs into the app.