user1766: The game "Salgado L, Iván vs 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?
Check https://es.chessbase.com/post/sabrina-vega-y-salvador-del-rio-de-angelis-campeones-de-ajedrez-de-espana-2018 for more information.

user15365: 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).

1766: <p>The game "<em>Salgado L, Iván vs Arroyo R, Jesús, 83rd ESP-ch 1-0</em>", shows this annotation after the last move:</p>

<blockquote>
  <p>Precision: White = 93%, Black = 18%.</p>
</blockquote>

<p>What does that phrase mean?</p>

<p>Check <a href="https://es.chessbase.com/post/sabrina-vega-y-salvador-del-rio-de-angelis-campeones-de-ajedrez-de-espana-2018" rel="nofollow noreferrer">https://es.chessbase.com/post/sabrina-vega-y-salvador-del-rio-de-angelis-campeones-de-ajedrez-de-espana-2018</a> for more information.</p>
 15365: <p>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.</p>

<p>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:</p>

<p><a href="https://lichess.org/qa/103/what-is-average-centipawn-loss" rel="nofollow noreferrer">https://lichess.org/qa/103/what-is-average-centipawn-loss</a></p>

<p>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).</p>
