What is the D’Alembert Blackjack Method?

For example, even if your opening bet was £5 you'd find yourself needing to stake £80 after five losses. Obviously this is beyond the financial scope of many novice players, bit fortunately this is where the D’Alembert method comes into play. 

The D’Alembert Method in Practice

If you lost this hand, you’d increase your next wager by one unit (£10 total). Assuming you lose this hand as well, your next bet would be three units (£15 total). If you came back and won the following hand, your next wager would be two units (£10 total).