One of the most successful ways to minimize your expected loss playing blackjack is this old Vegas wisdom: “If win, press your bets. If you lose, bet less.”. It pretty much boils down to betting more after a win, going down to the minimum of your bets after any loss. It’s a way to minimize your losses on the inevitable losing streaks — the one that kills people playing the Martingale system…
The “If win, press your bets. If you lose, bet less.” is basicly playing the Parlay system.
More info on these betting systems can be found in my post titled “Blackjack Betting Systems: a Method to my Madness“.
Good luck at the tables!