Go on the opponents turn, he or she could spend a lot of time thinking and you would just be sitting there. Or he or she may move quickly and not much was lost. Either way, I wouldn't dilly dally in there.
Help with OTB chess strategy (Serious!)
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Is it better to go to the bathroom on your turn and think about your move while your there, or go on your opponents turn, when it's his clock running and thinking is less impactful since he has a variety of different moves?