On 10.8.2006, Hattrick announced that even young players will loose stamina on a regular basis.
The effect always happens on Monday and they say that on average a player looses between
one and two levels per season.
On Monday, each player is affected in one of the following ways:
- the stamina skill drops and he looses TSI
- he just looses TSI
- no change is observed.
As the other skills, stamina also has subskills and stamina affects the TSI.
Since the other skills and form stay the same on Monday (at least for younger players),
the effective stamina loss can be estimated using the change in TSI.
The following tool is based on a TSI formula that was calibrated
based on a collection of more than 3500 players.
So it should be fairly accurate. Nevertheless, don't forget that it is just an estimate.