Some of the best advice I've ever heard comes from the following observation: Blundering is often a result of trying to overplay a small advantage. If you

Some of the best advice I've ever heard comes from the following observation: Blundering is often a result of trying to overplay a small advantage. If you are playing thoughtfully, with an eye on the whole game, you are smart enough not to blunder. It's when you get excited about pursuing an opportunity that you overlook mistakes. Play your advantages and play them hard. But don't lose sight of the big picture. Or alternatively, when you see an opportunity, look for the danger. The insight has served me extremely well in competitive and security contexts, and I think it accounts for a lot of blunders in product design as well.