When you play NBJ/WCB you are there to make money. A lot of money. ALL of the money. You are not there to goof off. The only way to get ALL of the money is to raise the stakes. To do that, we use the Fibonacci sequence, or something like it. The beauty of it is that it provides for exponential growth of your locked up winnings, combined with exponential growth of your betting level. In order to ride the Fibonacci wave to a high betting level, you need to survive. Not for one shoe, but for many shoes. Our methods allow us to, in certain games, win one hand in three. If we can do that, we can climb to higher and higher levels of Fibonacci. NOW IF we see a double down situation, it can be very very tempting. Players will encourage you to double. The dealer will encourage you. Don't let them influence you. Basic strategy relies on double downs, and other option plays to help make up for its low hands won rate. We use a different, better method to play our hand. We are challenging the dealer during low rounds. We are standing short when tens are running. We are doing all kinds of things to win one hand in three, suspending the progression if we suspect a low round. If we have practiced as we have been instructed to do, we are able to win one hand in three in some games. Our table buy-in is a pile of twelve units. Double downs increase risk to our pile of twelve. We know that there is cash galore as Fibonacci rides up. We trade in the short term benefit of some double downs so that we can reduce risk to our pile of twelve. Some day Fibonacci will turn your pile of 12 into a pile of 252. (That's 21 times 12.) When that happens, you'll be glad you stayed in the game and rode that sucker all the way up. When it happens, just keep on riding that wave until you reach table max. Incidentally, before you reach table max, you need a plan for when you get there. I recommend taking the table max, and dividing by 6 to allow for a 1-4-6. So if the table max is $5000, your unit size is around $800.