This only happen during IRT tournaments. Feed yourself correctly, and if you have concentration problems is another story but, in many cases i know it's about food.
Losing concentration
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I find I have this problem after I've been doing timed chess puzzles for an hour or so. I just miss stuff that would have been obvious an hour earlier. Not exactly the same thing since I'm trying to move in under 10 seconds, but I suspect it's similar. Do you have an organized, methodical thought process? I suspect that would help overcome some of the problem if you aren't already using one.
I find when I play games longer than an hour , I seem to lose concentration . I look at the board but I can't see anything . Does anyone else experience this . It's a weird feeling , and when it happens almost gauranteed I will make a blunder.If the game is important it seems to happen quicker as I'm concentrating more. What is a good way to combat this ?