The Ten Commandments of Gambling
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1. Thou shalt honor thy gambling debts.

2. Thou shalt expect to lose.

3. Thou shalt trust the odds, not hunches.

4. Thou shalt not over-bet thy bankroll.

5. Thou shalt not believe in betting systems.

6. Thou shalt not hedge thy bets.

7. Thou shalt covet good rules.

8. Thou shalt not make side bets.

9. Thou shalt have good gambling etiquette.

10. Thou shalt tip [ the waiter :-) ].

See 'The Wizard of Odds' regarding staking plans etc.
http://wizardofodds.com/gambling/bettingsystems.html