The rule
Never risk more than 5% of your total bankroll in a single session — and never bet more than 1–2% on a single hand or spin.
An example
If your monthly entertainment bankroll is R5,000, your session budget is R250. Your max single bet is R25–R50. This sounds small, but it's how serious players survive variance.
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Why it works
Even with a small house edge, short-term variance can wipe you out if you bet too big. Sizing down to 1–2% per bet means you can absorb 20–30 losses in a row and still be playing.
Adjust for volatility
On low-volatility games (blackjack, baccarat), 1–2% is fine. On high-volatility slots, drop to 0.5–1% per spin.