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A same game parlay — an SGP — is a parlay whose legs all come from one game. The name is the whole definition. What makes it a different bet from an ordinary parlay is not the rule, it is the pricing: legs inside one game move together, and the book prices them knowing that.
An ordinary parlay across four games is four roughly unrelated questions. A same game parlay is one question asked four ways. If a quarterback throws for a lot, his receivers usually catch a lot; if a game goes to overtime, almost every counting stat in it rises. Those legs are correlated, which means knowing one outcome genuinely changes the probability of the next.
Correlation runs the other way too. Two running backs on the same team splitting one workload are negatively correlated — the carries that go to one do not go to the other — and a ticket built on both is less likely to land than the multiplication suggests, not more.
Multiply the four legs of a same game parlay together and you will usually get a bigger number than the book is offering. That gap is not the book being stingy — it is the book correcting an assumption the multiplication makes and the game does not honour. Books either reprice the combination through their own correlation model or refuse the combination outright, and which legs are allowed together differs by book and by market.
This is also why a “true odds” figure for a same game parlay is a number to be suspicious of wherever you see it. Computing one honestly needs a joint model of the game, not a product of marginals. Parlay Builder does not publish one, and the correlation contract in the codebase explicitly forbids the chat and the builder from quoting one. It is a real limitation and it is stated rather than papered over.
Two things, and both are product behaviour rather than copy. The AI parlay generator prefers legs drawn from different games when it assembles a ticket, because that is the case where the arithmetic it shows you is closest to true. And where a ticket does end up with two legs in one game, the card prints a second correlation-adjusted combined figure beside the independent one instead of replacing it — so you can see the size of the assumption rather than inherit it.
Neither of those makes a same game parlay a good bet or a bad one. They make the number on the card mean what it says.
The useful questions are the boring ones. Which legs in this ticket share a game? Does the story that makes one leg land also make the next one land, or does it compete with it? Is the price the book is showing consistent with legs that move together, which is to say noticeably shorter than the multiplied one?
If a leg has a measurable history — how often this player has cleared this line, over how many games — that history is worth more than the narrative. Every prop on this site carries its own sample size for that reason.
A parlay whose legs all come from a single game. Sportsbooks market it under several names — same game parlay, SGP, and in the UK and Ireland, bet builder — but they describe the same construction.
Because the multiplication assumes the legs are independent and legs inside one game are not. The book reprices the combination through its own correlation model, and the difference between the two numbers is the size of that correction. It is not an error and it is not a fee.
No, and it will not pretend to. An honest figure needs a joint model of the game rather than the product of the individual legs, and we do not have one. The ticket card shows the independent estimate and a correlation-adjusted figure beside it, both labelled as estimates from history.
Because that is the case where the combined probability it shows is closest to the assumption behind it. It is a deliberate preference rather than a rule — you can still build a same-game ticket by hand — and the card warns when a build ends up with legs sharing a game.
Every prop with its measured hit rate, its sample size and the live price beside it. See tonight’s ranked prop board.
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Odds and lines come from licensed data feeds and refresh on a schedule; hit rates, edges and grades are Parlay Builder’s own calculations.