A lot of managers seem to think that the new performance and minute based stamina system (e.g. grey vs. yellow stars) is very confusing. Lately, discussions about whether there exists a random or rounded system in the background when it comes to stamina drops (grey stars) has been emerging.

The randomness and such comments about the new system pretty much comes from the fact that players with excellent stamina still are dropping in performance. Some managers state that formidable stamina is required to keep the ‘performance maximized as yellow stars’ throughout the full 90 minutes. There doesn’t seem to be a lot of managers that has considered the possibility that there is room for low/medium or high levels within the actual skill, e.g. low excellent stamina which might be the troublemaker behind the creation of all this. Another possibility is that yellow stars are considered maximum performance when reading the match report.

The two possibilities of low stamina within a level and rounding might also be connected as some managers have highlighted - if a player loses 0.51 stars this would be equal to showing the drop of one full star in the match report. If this is the case, then even if the player has high excellent stamina he might be shown in the report as having lost half a star, even though the performance was actually no less than 0.99 of the maximum.

I’ll quote AmonRaZZ excellent analysis in 11008491.41 as a possible answer:

[Ignoring red stars and players playing less/more than 90 minutes for clarity]

Dark (+ yellow) stars are the *average* performance (over 90 minutes)
Dark stars are *not* the maximum performance. As some seem to think.

Yellow stars are the final performance (90th minute)
Yellow / Dark stars is *not* the relative performance loss - and not even close

A simple example:

[Figures are merely illustrative, I’m not claiming they are the actual figures]

Pick a player with top performance of 10*

Suppose he gets tired at minute 80, and loses 0.1*/minute after that.

It’s final performance is 9*
=10-10×0.1

It’s average performance is 9.94*
=(80×10+9.9+9.8+…+9.0)/90

Displayed stars would be:

10* dark (+ yellow) (or 9.5* depending on the rounding)
9* yellow

The relative average performance would be 99.4% of it’s maximum
=9.94/10

NOT 90% (=9/10)

[The background information and data for this article was researched and collected through the Hattrick Library (Allience ID: 71795)]