It is a combination of single bets independent from each other. A necessary condition is winning the first selection. If first selection is lost, then the bet is lost. If you win your 1st bet, the winnings will kept aside and the same stake you initially have decided will be placed on the 2nd selection.

If the 2nd bet is a loser, on the third selection the amount of the stake is taken from the winnings generated from your 1st winning bet. Each next event is calculated by this principle. If the sum on the chain account is less than the sum of the 1st single bet stake, in the following events the single bet is counted proceeding from what is left in the account. If there isn’t any money left in the chain account, the chain is interrupted, and the bet is lost.