The game "Salgado L, Iván - Arroyo R, Jesús, 83rd ESP-ch 1-0", shows this annotation after the last move: "Precision: White = 93%, Black = 18%."

What does that phrase mean?

ref: https://es.chessbase.com/post/sabrina-vega-y-salvador-del-rio-de-angelis-campeones-de-ajedrez-de-espana-2018

(url corrected)

  • Your Chessbase link is broken. Can you fix it? – Brian Towers Sep 10 at 19:33
  • @Brian Towers The chessbase link was corrected. – djnavas Sep 11 at 17:59

It surely is a measure of the quality of play, the deviation of the game from a "perfect game", as understood by the engine used in the analysis. A perfect move will lose zero units of measure.

I couldn't find a chessbase source, but here it is a similar question on lichess, in which the unit of measure is called a centipawn:

https://lichess.org/qa/103/what-is-average-centipawn-loss

Centipawn loss could also be expressed as percentage, but as your question is about precision, they should be the opposite amount. In your example for white, a precision of 93% equals 7 centipawn loss (7% of inaccuracy).

  • tl;dr : It doesn't mean much. :) – Evargalo Sep 11 at 8:52
  • @Evargalo The answers in that thread are not too long. Do you mean that precision or centipawn loss measures don't mean much? – Daniel Alfredo Sottile Sep 11 at 13:59
  • Yes, that's what I mean, I think one shouldn't worry too much about these measures, especially precision aggregated on a whole game. But my comment was rather tongue-in-cheek, don't take it too seriously... – Evargalo Sep 11 at 14:36
  • 4
    Could it be that precision is the percentage of moves that coincide with some engine, running under some unknown parameters? – djnavas Sep 11 at 18:01
  • 1
    @djnavas Do you mean the percentage of moves that coincide exactly with the best move according to that engine? I don't think so, because it would be even more useless, as Evargalo said. – Daniel Alfredo Sottile Sep 12 at 10:42

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