Tempo
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A single move which improves your position. For example, you "gain a tempo" if you get the chance to develop a piece while your opponent uses the time to do nothing useful. You can also "gain a tempo" if you are able to make a useful or developing move while creating a threat that forces your opponent to defend with an otherwise useless move.
Hi folks! What exactly does this term mean? That if you slow your oppenent down from his "tempo", he is "one or two (etc) "Tempos" down?