Way back in the year two thousand nine, I wrote an article laying out basic strategy for Double or Nothing (DoN) Sit-and-Go tournaments. I had taken a break from them for a little while, just to mix up my game, but this month, I have gotten back into them full force. While it does seem that the competition in these tourneys has gotten tougher, there are still people who routinely make the dumbest mistakes imaginable. Thankfully, this has not only allowed me to make a few bucks, but it also gave me a topic for this article: common mistakes in Double or Nothing Sit-and-Go's. Playing Too Many Hands Early Anyone who has studied Sit-and-Go strategy knows that it is generally a good idea to play fairly tight in the early stages of the tournament. So, when I say that the most common mistake I see Double or Nothing players make is playing too many hands early, it sounds rather obvious. But I'm not talking about playing suited connectors or one-gappers too frequently. I'm talking about playing anything but the most premium of hands during the first couple levels. To give an example, it makes perfect sense to ...