Why do accumulators have such high variance?

Accumulators multiply the probabilities and odds of several selections together. Each additional leg reduces the win probability dramatically while increasing the potential return. A 5-fold acca at average 2.0 odds per leg wins just 3.1% of the time.

What does the P&L distribution show?

The P&L distribution shows the range of financial outcomes across all simulated seasons. The wide spread illustrates that even a mathematically sound acca strategy can produce wildly different real-world results season to season.

How many simulations should I run?

1,000 simulations give a reasonable picture. 10,000 simulations produce a stable distribution. More simulations take longer but converge to the true statistical picture.

Is there a positive expected value strategy for accumulators?

Only if each leg is a genuine value bet. If each leg has a small positive edge, the acca will too. However, booking marginsover multiple legs often ensure accas have significant negative expected value when placed at standard odds.

What is a realistic losing streak for accumulators?

For a weekly 5-fold acca at 2.0 odds per leg, you should expect losing streaks of 20+ consecutive weeks as a normal occurrence over a full season. Runs of 40+ consecutive losses are not unusual and visible in the simulator.

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