Losing 9 Spins in a Row at 20x
The chance of 9 losing spins in a row at 20x on the Wheel is 66.07%, or 1 in 1.51. At 20x a single spin loses 95.5% of the time.
The odds of 9 losses in a row
| Measure | Value |
|---|---|
| Chance of one loss at 20x | 95.5% |
| Chance of 9 losses in a row, starting from a given spin | 66.07% |
| Odds | 1 in 1.51 |
| Spins to wait for it, on average | 11.4 |
| Chance it happens at least once in 100 spins | 99.9%+ |
| Chance it happens at least once in 500 spins | 99.9%+ |
| Chance it happens at least once in 1,000 spins | 99.9%+ |
| Chance it happens at least once in 10,000 spins | 99.9%+ |
| Stake lost across the streak (1 per spin) | 9 |
| Stake a double-after-every-loss plan would need to survive it | 511 |
The average wait counts spins until the first run of 9 losses is completed. It is an average over many players, and any individual can see it on their first 9 spins or never. The "at least once" figures are exact: they account for a run starting on any spin, not just the first.
What it means
A streak of 9 losses has a probability of 95.5% to the power of 9, which is 66.07%. It is rare for any one run of 9 spins, but it does not stay rare if you keep going: across 500 spins the chance that it appears at least once is 99.9%+.
The next spin is not owed a win. After 8 losses the chance of a win on the next spin is still exactly 4.5%. The wheel has no memory, and a fresh provably fair roll is generated for each spin. Believing a win is overdue is the gambler's fallacy, and it is the most common reason stakes grow during a bad run.
Doubling after a loss does not fix it. Doubling the stake until a win needs 29 − 1 times your first stake to survive 9 losses in a row, and a table limit or an empty balance ends the plan well before the maths evens out. The 10% house edge applies to every stake in the plan, so betting more does not change the expected loss per unit staked.
Related
- 8 losses in a row at 20x
- 10 losses in a row at 20x
- Every losing streak at 20x
- The 20x multiplier in full
- 9 losses in a row at 10x
- 9 losses in a row at 12x
- 9 losses in a row at 15x
- 9 losses in a row at 18x
- 9 losses in a row at 25x