Inputs
Start from official selections
Parlay candidates are downstream of the same pick engine that feeds /today.
MLB parlay model
Parlays from picks,
not from decoration.
Posterior parlay candidates start with official model selections. The system looks for 4-6 leg combinations only after individual picks clear their own market, price, and quality gates.
Leg count
4-6
The target parlay size is large enough to be useful, small enough to stay interpretable.
Source
Picks
Candidates are built from the persisted actionable pick ledger.
Filter
Quality
A weak individual pick does not become acceptable because it is bundled.
01 / Intent
Construction
Prefer educated combinations
The system looks for combinations that make sense together across markets and games, rather than filling every possible slip.
Discipline
No cap on good ideas, no pass for bad ones
The product can show more parlay options as more qualified picks exist, but the underlying legs still have to be defensible.
02 / How it works
Step 01
Collect qualified legs
Only STRONG and LEAN style selections that clear market-specific quality gates enter the parlay pool.
Step 02
Build candidate groups
The parlay layer assembles 4-6 leg options from the available pick set after lock.
Step 03
Avoid forced coverage
If the slate does not have enough qualified legs, the model should publish fewer combinations rather than lower the standard.
Step 04
Preserve the receipt
Each leg remains tied to its individual pick record so outcomes can be reviewed after settlement.
Public proof
A parlay is only as good as its weakest leg.
Posterior does not add legs just to make the slip look busy. Unqualified rows stay out.
03 / Questions
How many selections are in a Posterior parlay?
The target range is 4-6 selections, using only picks that first pass individual quality gates.
Will every slate have parlays?
No. If the slate does not produce enough qualified legs, the model should avoid forcing low-quality combinations.
Are same-game parlays included?
Posterior can evaluate game and player markets, but parlay publication depends on the available qualified pick set and the product's current parlay rules.
Posterior is baseball data, not a sportsbook. The public receipt lives at /data, the methodology lives at /methodology, and today's board starts at /today.