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I am anaylizing my games with Fritz to get better, but there is an annotation in the analysis that I do not fully understand. Here is an example:

Annotation example

What do 0.53/21 and -0.25/24 mean?

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The score 0.53/21 means the chess engine evaluates the position after 6... Ng8-f6 at 0.53 pawns (or 53 centipawns) in White's favour after completing a search depth of 21 ply (or half-moves). It means White has a slight advantage.

Similarly -0.25/24 means the engine evaluates the position after 6... e7-e6 as 0.25 pawns (or 25 centipawns) in Black's favour after a search depth of 24 half-moves.

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  • What is the usefullness in knowing the search depth? Is it relevant for the reliability of the evaluation score? Commented Jan 3, 2021 at 22:23
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    @MartijnBurger If you could choose between an engine that looked 5 moves ahead and another that looked 20 moves ahead, regardless of whether they gave the same evaluation or not, in which engine's evaluation would you be more confident? Commented Jan 3, 2021 at 23:55
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    @MartijnBurger basically high depth is always good. An engine could evaluate a position at 0.53/21 and also evaluate the position as -3.3/50. The latter evaluation, being at much higher depth (i.e. the engine needs to think longer to search that far ahead), should also be more accurate.
    – Allure
    Commented Jan 4, 2021 at 5:36

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