The D'alembert betting system is a very simple system which is based upon mixing the Martingale and Insurance systems. You raise all bets one unit after each losing bet and you lower all bets one unit after each winning bet.
The sequence of betting and the betting amount that is raised or lowered can be changed slightly to fit certain games and odds better. The D'alembert betting strategy is generally used for even money betting.
The D'alembert betting strategy is a twisted positive progression betting system and is not very effective for any serious blackjack player. This system has been mathematically proven to be a losing system for blackjack and we do not recommend you use this betting system in any serious blackjack game.
Generally, the D'alembert system is recommended for the game of roulette and you should not use this strategy for blackjack games.
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