No betting strategy wins all the time. Even the most profitable professional bettors experience extended losing periods.
These losing stretches are known as downswings, and they are a completely normal consequence of variance.
The real challenge is not avoiding downswings—it is ensuring your bankroll is large enough to survive them.
A positive betting edge only produces long-term profits if you remain in the game long enough for that edge to play out.
A downswing is a period during which your actual betting results fall significantly below your expected results.
This happens because sporting events contain a large amount of natural randomness.
Even if every bet you place has positive Expected Value (EV), there will be periods where you lose far more bets than probability would suggest.
Downswings are not signs that your strategy has failed—they are an unavoidable part of probability.
The important question is not if they will happen, but how severe they might become and whether your bankroll can absorb them.
The largest loss experienced between a previous bankroll peak and the next lowest point is called the maximum drawdown.
It measures the worst decline your bankroll experiences before recovering.
Every betting strategy has an expected drawdown, even when it is profitable over the long run.
The higher your betting variance, the larger your expected drawdowns are likely to be.
While exact drawdowns vary from one betting sequence to another, a simplified estimate is:
Expected Maximum Drawdown ≈ 2 × √n × σbet ÷ 2
Where:
This provides a rough expectation of how large a normal losing period could become purely because of variance.
Suppose you plan to place:
Your expected maximum drawdown becomes:
2 × √500 × £60 ÷ 2 ≈ £1,342
This means that, during a typical sequence of 500 bets, it would not be unusual to experience a temporary bankroll decline of approximately £1,342, even if your betting strategy has a genuine positive edge.
Such a drawdown is a normal statistical expectation—not evidence that your system has stopped working.
Your bankroll should always be large enough to withstand expected drawdowns without creating financial or emotional pressure.
A commonly used conservative guideline is:
Minimum Bankroll ≈ 3 × Expected Maximum Drawdown
Using the previous example:
3 × £1,342 = Approximately £4,026
With average stakes of £50, this means each bet represents roughly 1.2% of the total bankroll.
This level of staking provides a reasonable buffer against normal losing streaks while allowing the betting edge sufficient time to generate profits.
The risk of ruin is the probability that your bankroll will eventually be exhausted before your long-term edge has time to produce positive results.
A simplified approximation is:
P(Ruin) ≈ e(−2 × Edge × Bankroll ÷ Variance per Bet)
This relationship highlights three important factors:
Even profitable bettors can go bankrupt if they bet too aggressively relative to the size of their bankroll.
Not all betting strategies require the same bankroll.
A strategy focused on heavy favourites generally experiences lower variance than one that specialises in long-priced outsiders.
As a result:
Your bankroll should therefore be determined by the level of variance in your betting strategy—not simply by your average stake size.
The purpose of bankroll management is not to maximise short-term profits.
Its purpose is to ensure you survive long enough for your positive Expected Value to emerge.
During inevitable losing periods:
A bettor who abandons a profitable strategy during a normal downswing never gives mathematics the opportunity to work.
Downswings are an unavoidable part of sports betting, even for highly profitable strategies. The size of these losing periods is determined primarily by variance, not by whether your betting edge is genuine. By estimating expected drawdowns, maintaining an appropriately sized bankroll, understanding the risk of ruin, and following disciplined staking rules, you greatly improve your chances of surviving short-term variance and allowing your long-term edge to produce sustainable profits.
