Chess/Tempo

Tempo

A tempo, or tempi in plural, is used in each game to calculate the developing moves in the opening or a measure of time.

Tempo in the opening

Tempi in the opening are related to the moves in the opening.

Gaining and losing tempi

Gain of tempi

a b c d e f g h
88
77
66
55
44
33
22
11
a b c d e f g h
Knight attacking a pawn

You gain tempi when you attack a piece with a developing move and the opponent can not defend the piece with a developing move, so he loses tempi.

Loss of tempi

a b c d e f g h
88
77
66
55
44
33
22
11
a b c d e f g h
Knight attacking the queen

You lose tempi when your opponent attacks your piece with a developing movement and you cannot defend that piece with a developing movement, so you have to spend one tempo by retreating your piece or defending it (with a non developing move).