This is a very simple craps strategy. You have placed your online craps bet. Each dice roll you win your wager you will increase the current bet by that initial one. Every time you lose you'll bet the current amount minus the initial one. As long as you are winning you will continue to raise your bets and when you start losing you'll bet the same bets but in a descending order.

This is known as the cancellation system. Pick a series of numbers, say 1,2,3,4,5. Your first bet is the total of the two numbers on the end, or 6 units in this case. If you lose it, you cancel out the 1 and the 5, add the six to the end of the series and bet the 6 and the 2, for a total of eight units bet. Lose that one and you add the eight to the series, cancel the 2 and the six and bet a total of 11 (3+8) and so on. If you win, you proceed to the inside numbers until they are all cancelled out. Again, a loser, but an insidious one.