There isn't really a right way or a wrong way these days. Some add all at the beginning, but color tends to be darker that way. Some add half at the beginning and then half towards the end, like in the last 15 minutes, and it tends to keep the beer lighter. I actually added all my extract in a cream ale at 45 minutes once, and read that most do half and half and got all worried that flavor might suffer some, but it ended up turning out great! The color and flavor were great, and I wouldn't hesitate to make it the same exact way all over again. I dunno if a judge in a competition would feel the same way, but I brew for myself and friends anyway, so that doesn't quite matter to me. I might send one in to a comp for feedback next time I make it that way, but honestly, even if the judge gave it a negative score, I enjoyed it, so it wouldn't bother me a bit.
