01 · What we can say
Do not confuse a UI cap with a safety signal.
The official Help Center currently says Combos are limited to sports moneyline, spread, and total markets. It does not publish a maximum leg count that Bookie can responsibly repeat here. A platform may reject a specific set of legs for eligibility or quotation reasons even if it lets you explore them individually.
02 · Bookie calculation
More legs make an all-or-nothing condition harder to clear.
Under an independence assumption, identical 80% legs combine like this. These are math examples only—not a model of a real Combo quote or a prediction about a game.
| Legs | Independence benchmark | Chance at least one fails |
|---|---|---|
| 1 × 80% | 80.0% | 20.0% |
| 2 × 80% | 64.0% | 36.0% |
| 3 × 80% | 51.2% | 48.8% |
| 5 × 80% | 32.8% | 67.2% |
The formula is p₁ × p₂ × … × pₙ. To find the chance that at least one leg does not resolve your way, subtract that product from 1.
03 · A useful decision question
Ask what each leg is doing in the position.
Rather than starting from “How many can I add?”, start from the explanation you would give for every leg. If you cannot describe why a leg belongs in the exact position, adding it only makes the result harder to understand.
- Can I identify the contract, selected outcome, and resolution condition for this leg?
- Does this leg express a separate idea, or is it closely tied to another leg already in the Combo?
- Am I looking at a venue quote, an explanatory probability calculation, or a manually entered number?
- If the platform cannot quote this exact set of legs, am I willing to leave it unexecuted rather than force a different request?
04 · Quick answers