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[[FILE:RotationsPerMinZollern.JPG|border|right|thumb| [https://en.wikipedia.org/wiki/Tachometer RPM gauge] <ref>[https://en.wikipedia.org/wiki/Tachometer RPM gauge] of an [https://commons.wikimedia.org/wiki/File:Zeche_Zollern_Kompressormotor.jpg?uselang=en electric driven air compressor] in the [https://commons.wikimedia.org/wiki/File:Zeche_Zollern_Dortmund_-_Maschinenhalle.jpg?uselang=en machine hall] of [[Arts#Zollern|Zollern II/IV Colliery]], [https://en.wikipedia.org/wiki/Dortmund Dortmund] [https://de.wikipedia.org/wiki/B%C3%B6vinghausen_(Dortmund) Bövinghausen], Germany - part of [[Arts#IndustrialHeritageTrail|The Industrial Heritage Trail]], Image by [[Gerd Isenberg]], September 18, 2016</ref> ]]

a [https://en.wikipedia.org/wiki/Measurement measure] of the chess program's [https://en.wikipedia.org/wiki/Speed speed]. But whereas comparing different version of the same program is fine, comparisons between different engines are more difficult, since programmers use different schemes of counting [[Node|nodes]]. The reciprocal of NPS is [https://en.wikipedia.org/wiki/Time time] per node, which translates to processor [https://en.wikipedia.org/wiki/Cycle_per_second cycles] per node.