Betting

🧩 System Bet (Lucky 15/31/63)

Trixie, Yankee, Lucky 15/31/63 — full breakdown of combination bets.

Result
How it works

The formula

System = all doubles/trebles/…/accumulators from N selections. Total stake = bets × unit.

Example: Lucky 15 (4 sel) = 4 singles + 6 doubles + 4 trebles + 1 four-fold = 15 bets.

FAQ

Questions

What is a Lucky 15?

15 bets from 4 selections: 4 singles, 6 doubles, 4 trebles, 1 fourfold.

Difference vs Yankee?

A Yankee is the same 11 multiples but without the 4 singles.

More tools

Related calculators

🔁

Odds Converter

Convert decimal, fractional, American, Hong Kong & implied probability instantly.

📈

Expected Value (EV)

Find the true EV, edge and ROI of a single bet.

✂️

Vig Remover / True Odds

Strip the bookmaker margin to reveal fair odds and true probability.

🎯

Parlay / Accumulator

Combine up to 20 legs into one payout with combined odds.

For entertainment & education only. OSOTOTO does not offer gambling. Results are mathematical estimates — variance means real outcomes differ. 18+. Need support? Self-check.