Don't let your clock time fall behind your opponent unless your REALLY need the time. If you're in a decent position toward the end it often pays off when your opponent doesn't have time to think.
Preperation for Chess Tournament
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May 1, 2017
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#3
Prepare yourself physically with exercising and play a lot of games with faster time controls that you feel comfortable in time trouble. I think everything from 5 minute to 15 minute games are quite useful. Furthermore some tactic training could be beneficial in the long run 
. hope this helps!
I have a chess tournament after 4 days and the time control is 10+5 and my strength is around 1900. Any useful advices?