um old advice is good advice... sit on your hands. Use your time wisely. No one but you can figure out how to learn to calm down in the hot seat, but you need to find your own way to do this. Meditaiton type ideas can help, or mentally examining the situation ... he is out of time, I have 10 min left, all I have to do is wait for his flag to fall or for his inevitable rushed mistake... find the best move you can, and wait for your opportunity.
Time Trouble
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Today in a tournament, I had my opponent in serious time trouble- under a minute and I had a winning position. Affected by his time trouble, I subsequently blundered on 6 consecutive moves and got wrecked. Any tips on how to make sure that this never happens again?