This is a kind of positive progression systems. It is based on the assumption that you will be able to win four times in a row. Actually, this happens quite frequently. Let's discuss the betting patterns for this strategy.
Your first bet will be equal to one unit. The second bet should be three units. The third bet size should reach two units, and the fourth bet is six units. For example, you are playing roulette, making even money bets and starting with five dollars. Having won, you should add five dollars to ten dollars lying on the table. After a win in the next spin, you have thirty dollars on the table, so it is necessary to take twenty of them. If you are lucky again, you should add ten dollars to twenty dollars in order to make six initial bets, i.e. thirty dollars. Then you should start with the initial bet of five dollars. No matter whether you won or lost the previous spin. It is also necessary to start from the beginning if you lose at any stage.
If you lose the first bet, you lose five dollars. The loss at the second stage will cost ten dollars, since you have added only one additional bet to the initial wager. Having lost at the third stage, you start again with a profit of ten dollars, since two previous victories have brought twenty dollars. If you fail at the last stage, this will bring you neither profits nor losses. However the victory will provide you with sixty dollars.
As you can see, you risk losing just two bets. At the same time, it is possible to win up to six bets. The main thing for you is not to lose the first two bets, because after that you will bet money won in the previous spins. In other words, you can lose six times at the most risky second stage and finish the whole session successfully only once and this will mean that you have not lost anything.
The undoubted advantages of the 1-3-2-6 betting system include the fact that it does not require a huge spread between the minimum and maximum bet (unlike, for example, the Martingale strategy).
As for the practical observations, such a system often makes it possible to gamble for a long period of time without any significant wins or losses. If you stop playing in time and do not chase huge payouts, a positive result can be relatively stable. However this does not mean that the total loss is impossible for such a strategy. The Lady Luck is a capricious woman.