Blackjack is a card game that can be approached in various ways and players have a healthy dose of flexibility given to them when it comes to bets. D’Alembert is yet another popularly used betting system that is meant to improve one’s chances of winning at blackjack.
It is just as easy to apply as the Martingale method and many players, both seasoned bettors and novice gamblers, use it. The system got its name from Jean le Rond D’Alembert who theorized that the occurrence of a long-term balance of failures and successes over the course of a row of events. Let’s see how this applies to blackjack.

Understand the System’s Objective
According to what D’Alembert claimed, a person has a higher likelihood of a win after a loss and a higher likelihood of losing after having won. The important factor here, however, is the assumption that this is manifested after a longer period of time.
Being a progressive betting system, when used in blackjack (it can also be used in games such as roulette and baccarat), D’Alembert requires the player to raise the bet by one unit after every loss, and to lower the bet by one unit after every win.
Most players describe this method as a light negative progression betting strategy that favors players on a budget. At the same time, you shouldn’t expect huge winnings from it. It delivers stable, small profits while allowing you to stay in the game longer.

Determine the Size of Your Unit
Prior to starting a real money blackjack game, you should establish what your starting unit will be, your initial bet that opens the betting cycle. The wise thing would be to start with the minimum stakes allowed in the game, especially if you have a smaller bankroll.
Of course, if you feel like you can afford to start with bigger stakes, you are free to do so.

The System at Work
Let’s say you have joined a blackjack table and determined the size of your starting bet, your one betting unit. The round starts and you’ve wagered the predetermined amount.
If you lost this hand, you should increase the wager by one unit. If you lose once again, repeat the process – increase the bet by one unit. In other words, add another unit to your previous bet and now wager three units.
Assuming you win this hand, your next bet should be decreased by one unit, therefore two units in total. As you can see, the D’Alembert system is not complicated. You simply need to keep track of what your previous bet was to know how to wager in the next round and effectively use the method.